Will my sex drive or erections change? | Reports vary, and partial erections can remain soft [OK Prostate Chip]

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 "changes in sex drive, erection medicine use, and partial erections" 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.

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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

Customers reported changes in desire and erections, sometimes alongside injuries.

Mr. Okada acknowledged friction, difficult retrieval, and limits to prolonged stimulation.

Current listings include related products, while several later experimental supports have no confirmed match.

If you see blood in your urine, even a small amount or for the first time, do not wait and see. See a urologist right away. If you suddenly cannot urinate, or the device cannot be removed, do not try to fix it yourself. Go to a medical facility, including emergency care, immediately.

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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.

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Before you read: key terms

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What happens: sex drive and erections

The OK Prostate Chip is a device placed in the urethra (the urine passage) to stimulate the prostate. This topic concerns reported changes in sexual desire, erections, and the wish to ejaculate while using chips or related supports. The entries discuss devices inside the urine passage and separate garments around the penis, which Mr. Okada explored for stimulation or reduced shrinkage. His reports include both increased desire and unwanted effects.

A January 2018 sex drive boost happened once, alongside later bleeding

In an entry published in January 2018, a customer wanted to explore sensations using a longer custom chip. They described renewed interest in sex after nearly 15 years, but only on the first occasion. After about 12 hours and repeated use, they reported urethral bleeding, mild pain, and blood clots in semen.

They also found the chip difficult to retrieve. Mr. Okada wrote that friction could not be eliminated. His reply favored shorter initial use and emphasized individual differences.

(Source: ok-lab's diary, published January 2018)
https://ok-lab.hatenablog.com/entry/20180118/1516263011

The August 2018 sex drive explanation acknowledges a hormone

In an entry published in August 2018, Mr. Okada suggested that chip use might lessen the decline in desire after ejaculation. His added note identifies prolactin (a hormone) as the accepted explanation for fatigue after ejaculation. The diary does not record whether chip use changes this hormone's release. Mr. Okada presents repeated sex as a possibility.

(Source: ok-lab's diary, published August 2018)
https://ok-lab.hatenablog.com/entry/20180818/1534566487

One August 2018 customer reported no longer needing ED pills

In an entry published in August 2018, a customer reported previously needing ED pills (medicines for erection difficulties). Even then, sex with their spouse had been limited to roughly once a month. They described more frequent sex after starting chip use and said they no longer needed those medicines.

The diary does not record which medicine they used or whether a clinician reviewed the change. The customer also reported bleeding with a custom glass screw-chip pair. Mr. Okada cautioned that this custom glass arrangement might be unsuitable.

(Source: ok-lab's diary, published August 2018)
https://ok-lab.hatenablog.com/entry/20180825/1535182626

November 2023 partial erection claims came with separate standard and custom prices

In an entry published in November 2023, Mr. Okada described a gourd-shaped urethral support intended to limit shrinkage. He estimated it could preserve about 80% of erect length for 24 hours, describing a soft partial erection. Standard SS, S, M, and L versions cost ¥8,000 (about $51 at ¥156 = $1, rate as of 2026-09-04) excluding tax, as published that month.

Custom pricing was total length in cm multiplied by ¥500 (about $3 at ¥156 = $1, rate as of 2026-09-04) excluding tax, within an approximate 12-25cm range. He reported fatigue when a chip was added for more than a day. Mr. Okada's response was to consider reducing time with the chip attached.

(Source: ok-lab's diary, published November 2023)
https://ok-lab.hatenablog.com/entry/2023/11/04/122744

May 2024 sex drive reports included exhaustion after repeated ejaculation

In an entry published in May 2024, Mr. Okada decided to begin selling an experimental chip for stimulation through the bladder. He described an urge to ejaculate that became difficult for him to ignore. Repeated sessions left him depleted, and his desire fell sharply after ejaculation.

Mr. Okada wrote that important questions about the stimulation remained unanswered. He had not felt confident enough to test it during sleep. His warning singled out use during sleep or for several days, particularly before users understood their response.

(Source: ok-lab's diary, published May 2024)
https://ok-lab.hatenablog.com/entry/2024/05/18/122913

July 2024 sex drive discussions accompanied the tube-belt version's discontinuation

In an entry published in July 2024, Mr. Okada discussed an external flattening garment (underwear intended to hold the penis inward). He discontinued the earlier tube-belt version. Its replacement used swimsuit fabric for the front panel, ties, and stitching, with a separate ceramic plate.

The garment and plate each cost ¥6,000 (about $38 at ¥156 = $1, rate as of 2026-09-04) excluding tax, as published in July 2024. Mr. Okada linked the plate opening's fit to how readily an erection returned after the garment was off. He suggested considering different plate openings because their feel varied.

(Source: ok-lab's diary, published July 2024)
https://ok-lab.hatenablog.com/entry/2024/07/20/123059

April 2025 partial erection support did not promise intercourse firmness

In an entry published in April 2025, Mr. Okada described a petal-loop support with a 0.2mm wire. His historical sizing proposal was about 3cm beyond shrunken penile length; he reported that when the wire exceeded the urethral length in the shrunken state by 5cm, the petal loops protruded from the urethral opening. Prices including the loop were ¥4,000 (about $26 at ¥156 = $1, rate as of 2026-09-04) up to 10cm, ¥5,000 (about $32 at ¥156 = $1, rate as of 2026-09-04) up to 20cm, and ¥2,000 (about $13 at ¥156 = $1, rate as of 2026-09-04) extra for petals, all excluding tax.

He also described light erections during sleep and suspected these were leaving him short of sleep. The diary does not record permanent enlargement. Mr. Okada explicitly cautioned that preventing shrinkage did not provide the hardness needed for intercourse.

(Source: ok-lab's diary, published April 2025)
https://ok-lab.hatenablog.com/entry/2025/04/19/122913

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The maker's answer to sex drive and erections

Mr. Okada reports limits and cautions, while leaving several explanations uncertain.

January 2021 sex drive testing revealed a retrieval problem

In an entry published in January 2021, Mr. Okada tested a wire-supported chip intended to respond to changes in penile length. With excess wire inside the urine passage, the leading chip moved almost entirely into the bladder. Mr. Okada reported difficulty retrieving it and explicitly rejected that arrangement.

(Source: ok-lab's diary, published January 2021)
https://ok-lab.hatenablog.com/entry/2021/01/30/122153

The April 2023 sex drive experiment was explicitly discouraged

In an entry published in April 2023, Mr. Okada described an experiment involving a urethral instrument extending deep into the bladder. He reported unchanged desire after ejaculation, but intermittent abdominal pain for about half a day. He suspected strain on the bladder. Mr. Okada explicitly said he did not recommend this experiment.

(Source: ok-lab's diary, published April 2023)
https://ok-lab.hatenablog.com/entry/2023/04/29/123107

November 2024 sex drive enthusiasm came with a placement warning

In an entry published in November 2024, Mr. Okada described an unpublished prototype intended to apply a gentle pulling effect near the prostate. He reported near-daily desire and light erections when waking during the night. His caution was that anyone struggling with existing chip placement would find this prototype particularly difficult to place.

(Source: ok-lab's diary, published November 2024)
https://ok-lab.hatenablog.com/entry/2024/11/09/122930

If you see blood in your urine, even a small amount or for the first time, do not wait and see. See a urologist right away. If you suddenly cannot urinate, or the device cannot be removed, do not try to fix it yourself. Go to a medical facility, including emergency care, immediately.

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How sex drive and erections changed over time

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OK Prostate Chip products related to sex drive and erections

Current listings identify related items, but do not establish the reported effects.

Products that appear in these entries

The current list does not specify the historical SS size or cable arrangement. These prices are from the September 4, 2026 list.

The medium-length ceramic chip is listed in OK Lab's own online store.

The 2017 fabric penis holder is listed in OK Lab's own online store.

(Source: ok-lab's diary, published August 2020)
https://ok-lab.hatenablog.com/entry/2020/08/29/130333

(Source: ok-lab's diary, published March 2022)
https://ok-lab.hatenablog.com/entry/2022/03/26/123336

Products the diary mentioned as alternatives

The studded-chip option is listed in OK Lab's own online store.

(Source: ok-lab's diary, published August 2020)
https://ok-lab.hatenablog.com/entry/2020/08/29/130333

Custom chips, wire prototypes, gourd support, petal loops, bladder-based chip, and flattening underwear: No matching product can be confirmed on the current list.

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Common worries about sex drive and erections

Reader questions concern changing sensations, repeated ejaculation, and the fit of experimental supports.

"Can sex drive changes also affect thoughts or feelings?"

In an entry published in October 2019, a prospective customer asked whether chip use could affect the body or mind. Mr. Okada thought effects would be stronger in people with greater prostate sensitivity or traits he described as feminine.

These were his personal views; the diary does not record what happened to this customer. He declined to predict whether a particular size would suit a beginner and advised a smaller starting size.

(Source: ok-lab's diary, published October 2019)
https://ok-lab.hatenablog.com/entry/2019/10/05/141806

"Why did my sex drive return immediately after ejaculation?"

In an entry published in August 2020, a customer wanted prolonged pleasure without ejaculation from a medium-length ceramic chip. Instead, they reported one ejaculation with the chip and two by hand within a short period. They asked why their response had changed, after previously feeling satisfied by a single ejaculation.

Mr. Okada's reply did not explain that change; the customer also reported early pain and inflammation in the urine passage. He suggested a studded chip as an option for their wish for stronger sensations once sales resumed.

(Source: ok-lab's diary, published August 2020)
https://ok-lab.hatenablog.com/entry/2020/08/29/130333

"Can partial erection support fit entirely inside the urethra?"

In an entry published in April 2022, a customer asked for a supported cable contained entirely within the urethra. They wanted something easier to retrieve than a previous chip. Mr. Okada first rejected the proposed length, then accepted a shorter specification after further discussion.

His own test later made him reconsider: he thought the support reduced shrinkage and his first advice might have been wrong. The diary does not record how the customer's finished item felt in use. Mr. Okada's revised reply suggested considering a longer version for a future order.

(Source: ok-lab's diary, published April 2022)
https://ok-lab.hatenablog.com/entry/2022/04/09/123458

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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.

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Summary of this article

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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.