Can I ejaculate or have sex with a chip inside? | The diary records bleeding and injury [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 "ejaculation and sex with a chip inside" 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

• The diary records suspected semen backflow, bleeding, and a broken glass chip associated with ejaculation while the device remained inside.
• The maker calls for condoms during sex because exposed or expelled parts could harm a partner.
• The current list includes models named in these accounts; no alternative is specifically recommended for this worry.

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: ejaculation with a chip inside

The OK Prostate Chip is a small device placed in the urethra to act on the prostate from inside. The diary discusses leaving it there during ejaculation or sex, with a thread connecting the main chip to smaller supporting pieces. Those pieces include a safety chip (an end piece intended to keep the device accessible). The question is whether sexual activity changes the risks for the wearer or their partner.

Sex with a chip inside raised concerns about exposed parts

In an entry published in October 2017, Mr. Okada described connected chip parts on a single retrieval thread (a line intended for recovery). The thread was medical nylon stitching thread, about 0.2 mm in diameter. He considered sex safer when all the chips were inside the urethra.

He made a separate allowance for condoms: with one present, he thought an external safety chip during an erection was acceptable and more reassuring. Mr. Okada advised choosing thread lengths with individual anatomy and changes during erections in mind.

(Source: ok-lab's diary, published October 2017)
https://ok-lab.hatenablog.com/entry/20171009/1507521149

Ejaculation with a chip inside prompted an early backflow warning

An entry published in January 2018 described linked chips with a 0-2 mm gap and overall length of at least 5 cm. Mr. Okada considered it easier to insert, but dangerous for beginners because it could reach the bladder too easily. His concern involved the internal urethral sphincter (the muscle at the bladder outlet), which he described as closing during ejaculation.

He warned that a chip spanning this muscle could prevent closure and allow semen to enter the bladder. Mr. Okada therefore cautioned against assuming that easier insertion meant a design was suitable for a beginner.

(Source: ok-lab's diary, published January 2018)
https://ok-lab.hatenablog.com/entry/20180114/1515943724

A glass chip broke after ejaculation without immediate pain

In an entry published in February 2019, a customer described a glass semi-long twisted chip (42 mm, thread 24 cm) breaking. After about 2 hours inside, ejaculation was painless; urination later expelled the body with its tip missing. Persistent abdominal discomfort led to medical care a week later; cystoscopy (a camera examination inside the bladder) found extensive lining damage but no foreign object.

Despite no visible or test-detected blood, the customer believed the sharp fracture caused injury and feared bladder perforation (a hole through its wall). The customer suspected ejaculation stressed the curved glass, but the missing piece was never recovered and the breakage mechanism remained unconfirmed. Mr. Okada apologized and encouraged readers to learn from the account, whose sender urged early medical attention.

(Source: ok-lab's diary, published February 2019)
https://ok-lab.hatenablog.com/entry/2019/02/02/153358

Bleeding during ejaculation had no confirmed cause in this reply

In an entry published in January 2021, a customer reviewed a bent-connection screw chip supplied alongside a sea-slug-shaped chip (Umiushi Ver.5). After about 10 minutes, ejaculation brought slight bleeding; the customer said bleeding during ejaculation with chips was a recurring experience. The account described successful removal, but did not establish what caused the bleeding.

Mr. Okada said he had little comparable experience apart from broken glass. He explicitly declined to guess the cause, so his reply supplied no explanation for this customer's recurring bleeding.

(Source: ok-lab's diary, published January 2021)
https://ok-lab.hatenablog.com/entry/2021/01/09/130022

Chip removal after ejaculation was followed by repeated bleeding

In an entry published in October 2021, a customer using a sea-slug-shaped chip (Umiushi Ver.4) described bleeding every time it was withdrawn. Usually this followed ejaculation, with a sudden releasing sensation deep inside; the customer wanted an explanation and a solution. Staff said this design resisted expulsion and had attracted reports of difficult removal.

They suggested prostate contractions might push it toward the bladder, while strain during withdrawal could contribute to bleeding. Staff also proposed that semen could change from slippery to glue-like after ejaculation. Their caution was that the sudden release described by the customer suggested excessive force.

(Source: ok-lab's diary, published October 2021)
https://ok-lab.hatenablog.com/entry/2021/10/23/125707

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The maker's answer to ejaculation with a chip inside

The maker's responses address partner protection, semen residue, and stopping when discomfort changes, without confirming the causes of individual injuries.

Condoms became an explicit requirement for sex with a chip inside

An entry published in July 2021 presented a leaflet requiring condoms during sex with the device in place. Its stated concerns were injury to a partner's internal tissue and a chip remaining inside the partner. The same leaflet said its claimed effects were not guaranteed. The maker's stated precaution was condom use to address those partner-related hazards.

(Source: ok-lab's diary, published July 2021)
https://ok-lab.hatenablog.com/entry/2021/07/24/125923

Discomfort after ejaculation was linked to residue on flexible tubing

In an entry published in November 2023, Mr. Okada described unexpected discomfort from a gourd-shaped urethral sound (a device for stimulation inside the urine passage). He reported that semen left on its flexible tubing had become crusted and rough. According to his account, the tubing's expansion made that roughness more noticeable.

He suspected similar residue could explain why a chip sometimes felt unpleasant after ejaculation. He also distinguished semen from other sexual fluids, which he believed lacked the same tendency to harden. His advice focused on addressing accumulated residue rather than treating the changed sensation as unexplained.

(Source: ok-lab's diary, published November 2023)
https://ok-lab.hatenablog.com/entry/2023/11/18/122841

Historical guidance on bleeding after ejaculation differs from this page's immediate-care warning

The leaflet published in July 2021 specified at least 3 days without use after bleeding. It tied medical consultation to continued bleeding, a narrower trigger than the immediate-care warning on this page. It also advised promptly stopping when discomfort differed from normal.

(Source: ok-lab's diary, published July 2021)
https://ok-lab.hatenablog.com/entry/2021/07/24/125923

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 ejaculation with a chip inside changed over time

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OK Prostate Chip products related to ejaculation with a chip inside

The current list includes model names appearing in these accounts, including the glass design involved in a breakage report.

Products that appear in these entries

(Source: ok-lab's diary, published May 2018)
https://ok-lab.hatenablog.com/entry/20180524/1527153380

(Source: ok-lab's diary, published February 2019)
https://ok-lab.hatenablog.com/entry/2019/02/02/153358

Products the diary mentioned as alternatives

The diary names no alternative.

The linked pair, January 2019 screw chip, long vibrating chip, and requested threadless design are historical references in these entries. No matching product can be confirmed on the current list.

Other historical designs include the bent-connection screw chip, sea-slug-shaped chip (Umiushi Ver.4), and gourd-shaped urethral sound. No matching product can be confirmed on the current list.

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Common worries about ejaculation with a chip inside

Customer questions cover reduced semen output, partner injury, pain, and whether sex with the device is possible.

"Why does ejaculation with a chip inside produce little semen?"

In an entry published in May 2018, a customer asked why the long chip was associated with only 2 or 3 drops. The customer described normal ejaculation with single-chip and two-chip designs, but an almost empty result with the long one. Mr. Okada considered backflow into the bladder the likely explanation.

He also acknowledged that he was not qualified to provide a medical answer. The diary does not record a medical assessment confirming backflow in this customer.

(Source: ok-lab's diary, published May 2018)
https://ok-lab.hatenablog.com/entry/20180524/1527153380

"Could sex with a chip inside hurt my partner?"

A separate customer account published in May 2018 described sex with a long chip in place, ending without ejaculation because the customer feared expulsion. The customer wanted to avoid scratching a partner or leaving a chip and thread inside them. A request for a threadless design followed, alongside recognition that a condom could contain expelled parts.

Mr. Okada thanked the customer but supplied no assessment of that proposed design in this passage. The diary does not record whether the requested threadless chip was supplied.

(Source: ok-lab's diary, published May 2018)
https://ok-lab.hatenablog.com/entry/20180524/1527153380

"Does pain with a chip inside confirm correct placement?"

In an entry published in January 2019, a screw-chip customer asked whether a dull ache during certain movements meant the device was correctly positioned. Mr. Okada related his own discomfort during prolonged use of a long vibrating chip to possible irritation near the bladder outlet. This was his interpretation of personal experience.

He separately suggested prostate contractions could explain pain during ejaculation with a chip present, describing some pain as temporary. Mr. Okada warned that repeatedly occurring pain might instead reflect a problem with the prostate itself.

(Source: ok-lab's diary, published January 2019)
https://ok-lab.hatenablog.com/entry/2019/01/26/152042

"Can condoms protect partners during sex with a chip inside?"

In an entry published in February 2023, a customer seeking more sensation also asked whether sex with the chip inside was possible. Mr. Okada thought condom use could address the concern about effects on a partner. However, he said reports of bleeding during ejaculation with a chip in the prostate were frequent.

He suggested contractions created unusual conditions, without establishing a cause for any particular person's bleeding. His reply left the decision about ejaculation to the customer; the passage records no subsequent experience.

(Source: ok-lab's diary, published February 2023)
https://ok-lab.hatenablog.com/entry/2023/02/18/122910

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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.