![What does Cowper's gland stimulation feel like? | The maker describes a milder sensation [OK Prostate Chip]](/img/a/T0775/eyecatch.svg)
This page is based on entries from "ok-lab's diary" (https://ok-lab.hatenablog.com/), the Japanese development diary written by Mr. Okada, founder of OK Lab, a small company in Japan (Okada Comfortable Life Laboratory). Only the entries about "Cowper's gland stimulation" are summarized here, in order of publication. Past prices and sizes are as written at the time. Current prices come from the official product list (retrieved September 4, 2026). Quotations are translated from Japanese.
Note: This page is a personal reading log by someone with no connection to the maker or the seller. It reflects the source entries as of their publication dates and makes no guarantee of accuracy or safety. The product is not a medical device; talk to a doctor about any health decision. Check the official site for current information. This page contains advertising.
In short
Mr. Okada describes Cowper's gland sensations as milder than prostate sensations, based on his experiences and interpretations of customer reports.
He suggested auxiliary support for some cases, while warning that glass could break.
The screw-shaped auxiliary chip option remains listed at ¥3,300 (about $21 at ¥156 = $1, rate as of 2026-09-04) including tax.
About this product
The OK Prostate Chip is a small device that is placed in the urethra (the urine passage) so that it acts on the prostate; the maker sells it in several shapes, sizes and materials. It is made and sold by OK Lab (Okada Comfortable Life Laboratory), a small company in Japan, through its own online store, and prices are in Japanese yen (JPY). The maker's development diary, "ok-lab's diary", is written in Japanese. This page is an English summary of it, and every quotation is translated. OK Lab ships internationally, so readers outside Japan can order (see "Buying from outside Japan" below). Product names on this page are plain-English descriptions. The official Japanese product name is shown once in the product table so you can find the same item in the store.
Before you read: key terms
| Term | Plain-English meaning |
|---|---|
| Urethra | The urine passage, which carries urine out of the body; the chip occupies part of this passage. |
| Cowper's glands | Glands that release fluid, according to the diary; Mr. Okada associates their surroundings with the sensations discussed here. |
| Bulbar urethra | A wider section of the urine passage; the diary discusses it as a location for supporting a chip. |
| External and internal urethral sphincters | Structures described around the prostate passage. Their normal biological function: The diary does not explain this. |
| Auxiliary chip | An additional supporting part, discussed as helping the main chip stay in place. |
| Stopper | An accessory intended to limit chip movement; the diary distinguishes movement toward the bladder from movement toward the exit. |
What happens: Cowper's gland stimulation
The OK Prostate Chip is a small device placed in the urethra (urine passage) to act on the prostate. Cowper's glands are described in the diary as fluid-releasing glands near the bulbar urethra (a section of that passage). Mr. Okada associates sensations around this area with chips or supporting parts located nearby. He also discusses this area as a place where supporting parts can help a chip stay in position.
Cowper's gland stimulation was associated with chip movement in October 2017
In an entry published in October 2017, Mr. Okada described the smallest glass microchip as approximately 25 mm long. He wrote that forceful urination could move a chip from the prostate region into the bulbar urethra.
He associated fluid-releasing Cowper's glands around that region with continued sensations different from prostate stimulation. He described these sensations as gentle and suitable for prolonged enjoyment in his experience. However, he did not consider them equivalent to the strongest prostate sensations he described elsewhere in the paragraph.
(Source: ok-lab's diary, published October 2017)
https://ok-lab.hatenablog.com/entry/20171005/1507210406
Mr. Okada described Cowper's gland stimulation without muscle contractions in December 2019
In an entry published in December 2019, Mr. Okada interpreted a customer's account of differing chip sensations as probably involving Cowper's glands. He used sweetness to describe the sensation, distinguishing it from a feeling of muscles contracting.
Separately, he recalled a report involving a ceramic semi-long chip, size S, and a screw-shaped auxiliary chip (an additional supporting part). He suspected that customer's description also concerned Cowper's glands. Neither explanation was presented as a confirmed identification of the source of sensation. Mr. Okada suggested that the screw-shaped accessory could be especially effective for people sensitive in that area.
(Source: ok-lab's diary, published December 2019)
https://ok-lab.hatenablog.com/entry/2019/12/28/131319
A May 2021 surgery report prompted a broader explanation of Cowper's gland stimulation
In an entry published in May 2021, a customer described unfamiliar sensations from a ceramic semi-long chip after prostate surgery. The customer also reported fluid travelling along the chip's thread. Mr. Okada replied that most pleasure seemed to arise near the external and internal urethral sphincters (structures bordering the prostate passage).
He added that he personally felt sensations near Cowper's glands, before the external sphincter. He speculated that shorter anatomy could bring three sensitive areas within one chip's reach. Because he expected a shorter prostate region to complicate stable placement, he suggested a screw-shaped auxiliary chip for support in the bulbar area.
(Source: ok-lab's diary, published May 2021)
https://ok-lab.hatenablog.com/entry/2021/05/15/130037
An October 2021 ring experiment suggested milder Cowper's gland stimulation
In an entry published in October 2021, Mr. Okada described a custom ring intended to help keep his chip in place. He believed its effect involved Cowper's glands and described the resulting sensation as milder and warmer than prostate sensations. He presented this as an unfinished account of his own experiment.
(Source: ok-lab's diary, published October 2021)
https://ok-lab.hatenablog.com/entry/2021/10/23/125707
In February 2024, Mr. Okada associated a rear bulge with Cowper's gland stimulation
In an entry published in February 2024, Mr. Okada described his experience with a three-bulge chip. He said its rear bulge usually rested in the bulbar urethra, slightly away from the sphincter.
He associated that position with the Cowper's gland area and considered the sensation pleasant. He reported that the chip sometimes shifted back toward that position. Mr. Okada invited further customer reports because he thought other users might recognize features he had not explored.
(Source: ok-lab's diary, published February 2024)
https://ok-lab.hatenablog.com/entry/2024/02/03/123017
A June 2025 curved device reportedly provided satisfying Cowper's gland stimulation
In an entry published in June 2025, Mr. Okada described a curved device nicknamed the centipede. He said its two petal-shaped parts seemed to stimulate the Cowper's gland area. He reported satisfaction with that effect and again described himself as sensitive there.
(Source: ok-lab's diary, published June 2025)
https://ok-lab.hatenablog.com/entry/2025/06/21/122934
The maker's answer to Cowper's gland stimulation
Mr. Okada's proposed measures addressed material friction and chip stability, with different limits for each.
Glass addressed a movement problem associated with Cowper's gland stimulation
In an entry published in October 2017, Mr. Okada explained that urine could wash away lotion, leaving less lubrication for subsequent chip movement. He wrote that glass was the only material he had found that still moved smoothly under those conditions. His silicone and other plastic prototypes had not satisfied him during extended wear, despite favorable short-term results.
At that time, he claimed that continuous, long-term placement required glass. That claim accompanied his discussion of movement between the prostate region and the bulbar urethra. Mr. Okada nevertheless warned that glass could break and that complete safety was not possible.
(Source: ok-lab's diary, published October 2017)
https://ok-lab.hatenablog.com/entry/20171005/1507210406
Auxiliary support was proposed for a slipping chip during Cowper's gland stimulation
In an entry published in December 2019, OK Lab answered a beginner whose chip came out during urination. The customer had first bought a short chip and then ordered a semi-long chip; the message does not clearly identify which slipped. Staff described a curved, bead-shaped chip whose curved section was intended to stabilize it in the bulbar urethra.
The diary does not record whether this customer bought an accessory or whether the slipping stopped. From the developer's perspective, the reply favored the screw-shaped auxiliary chip for easier insertion and reduced slipping during urination.
(Source: ok-lab's diary, published December 2019)
https://ok-lab.hatenablog.com/entry/2019/12/28/131319
A stopper had directional limits in the discussion of Cowper's gland stimulation
Mr. Okada's answer in an entry published in February 2024 distinguished two meanings of staying in place. He thought part of a chip could remain within the prostate region even while the device shifted. Complete immobility, however, was difficult in his view.
His explanation also distinguished movement toward the bladder from movement toward the urethral opening. Mr. Okada said a stopper (an accessory intended to limit movement) was needed when a chip moved toward the bladder. He cautioned that it might not prevent movement in the opposite direction.
(Source: ok-lab's diary, published February 2024)
https://ok-lab.hatenablog.com/entry/2024/02/03/123017
How Cowper's gland stimulation changed over time
| Published | What the diary said then |
|---|---|
| Oct 2017 | Glass was selected for movement after lotion loss; breakage remained a concern. |
| Dec 2019 | Auxiliary support was proposed for slipping; a curved bead design was explained. |
| May 2021 | A surgery report prompted support advice for a shorter prostate region. |
| Oct 2021 | Mr. Okada's custom ring experiment produced sensations he considered milder. |
| Feb 2024 | Mr. Okada distinguished partial placement from complete immobility and explained stopper limitations. |
| Jun 2025 | A two-petal curved device reportedly suited Mr. Okada's personal sensitivity. |
OK Prostate Chip products related to Cowper's gland stimulation
The current list includes the ceramic semi-long chip and screw-shaped auxiliary option discussed in December 2019.
Products that appear in these entries
| Product (official name) | Price incl. tax | Relation to this topic |
|---|---|---|
| Ceramic semi-long chip (OKプロステートチップ 陶器素材セミロングタイプ) | ¥4,400 (about $28 at ¥156 = $1, rate as of 2026-09-04) | December 2019 recalls a customer's sensations from this chip, historically identified as size S, combined with screw-shaped auxiliary support. |
The ceramic semi-long chip is listed in the company's own online store.
(Source: ok-lab's diary, published December 2019)
https://ok-lab.hatenablog.com/entry/2019/12/28/131319
Products the diary mentioned as alternatives
| Product (official name) | Price incl. tax | Relation to this topic |
|---|---|---|
| Screw-shaped auxiliary chip option (スクリュー型補助チップ追加オプション) | ¥3,300 (about $21 at ¥156 = $1, rate as of 2026-09-04) | December 2019 favored this accessory for a beginner's slipping chip, citing easier insertion and reduced slipping during urination. |
The screw-shaped auxiliary chip option is listed in OK Lab's own online store.
(Source: ok-lab's diary, published December 2019)
https://ok-lab.hatenablog.com/entry/2019/12/28/131319
Other historical descriptions include the glass microchip, custom ring, unspecified curved bead-shaped chip, three-bulge chip, and curved two-petal device. No matching product can be confirmed on the current list.
Common worries about Cowper's gland stimulation
The reader questions concern chip size and stability; the diary does not record either questioner's later results.
"Can short chips stay put during Cowper's gland stimulation?"
In December 2019, the beginner's request for advice concerned a chip that came out during urination. Mr. Okada replied that even short chips could sometimes remain in place during urination. He considered complete expulsion potentially manageable, while accepting that movement away from the prostate could occur.
(Source: ok-lab's diary, published December 2019)
https://ok-lab.hatenablog.com/entry/2019/12/28/131319
"Would a larger chip help with Cowper's gland stimulation?"
The beginner writing in December 2019 thought a slightly larger chip might suit them and asked which product to choose. Staff explained that a very small semi-long chip could be difficult to feel in the bulbar area. Their reply included a larger semi-long chip among the possibilities, alongside the supporting designs discussed above.
(Source: ok-lab's diary, published December 2019)
https://ok-lab.hatenablog.com/entry/2019/12/28/131319
"Does Cowper's gland stimulation mean the chip spans the prostate?"
The reader writing in February 2024 imagined a longer chip spanning the prostate, with its end bulges beyond the surrounding sphincters. That interpretation led to their question about whether the chip could stay in place. Mr. Okada said such a configuration might occur with a longer three-bulge chip, but the question had surprised him.
He distinguished the reader's interpretation from his own experience described earlier. He expressed interest in investigating it, while suspecting his own chip would shift because of his bladder-side sphincter. The diary does not record whether the questioner subsequently tried that model.
(Source: ok-lab's diary, published February 2024)
https://ok-lab.hatenablog.com/entry/2024/02/03/123017
Buying from outside Japan
OK Lab ships internationally to countries covered by Japan Post's EMS courier service. Overseas orders are paid in advance by PayPal. Each order carries a ¥400 (about $3 at ¥156 = $1, rate as of 2026-09-04) handling fee, and EMS shipping is charged on top. These terms come from OK Lab's official sales-terms page (written here as plain text, not a link: ok-lab.net/docs/law), checked on September 7, 2026; confirm them on the official store before you order, because they can change.
Summary of this article
| What you wanted to know | The answer |
|---|---|
| What is the short answer? | Mr. Okada describes milder sensations that he associates with Cowper's glands. |
| What is this product? | A small urethral device made and sold by OK Lab in Japan. |
| Which terms matter? | The diary distinguishes Cowper's glands, the bulbar urethra, sphincters, auxiliary support, and stoppers. |
| What happened in the accounts? | Customers and Mr. Okada described sensations that he interpreted as involving the Cowper's gland area. |
| What did the maker propose? | Material choices and supporting accessories, alongside warnings about glass and limits on chip stability. |
| What changed over time? | The discussion expanded from glass and displacement to accessory support and personal prototype experiments. |
| Which related products are currently listed? | The ceramic semi-long chip costs ¥4,400 (about $28 at ¥156 = $1, rate as of 2026-09-04); the screw-shaped auxiliary option costs ¥3,300, (about $21 at ¥156 = $1, rate as of 2026-09-04) both including tax. |
| What did readers ask? | Whether size, supporting parts, or the chip's shape affected its ability to stay in place. |
| How does overseas buying work? | Advance PayPal payment, a ¥400 (about $3 at ¥156 = $1, rate as of 2026-09-04) handling fee, and additional Japan Post EMS shipping charges. |
| What does the overall account establish? | It records the maker's interpretations and individual experiences, with sensitivity differing between the accounts. |
Source: ok-lab's diary (Okada Comfortable Life Laboratory). The original entries are in Japanese; quotations on this page are translated. Photos and videos are on the original entries.
This article is a summary of the maker's development diary. The product is not a medical device and no result is guaranteed. If anything feels wrong or worries you, see a doctor. Prices, specifications and cautions change, so confirm the latest information on the official blog and the official site. Questions about ordering and shipping go to the seller.