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About Logical Sperm Bank
Logical Sperm Bank is a private sperm bank operating in Japan. We connect people who wish to have a child with registered sperm donors who agree to disclose an accurate, honest profile and to donate under a framework of identity verification, health screening, and written agreements. We call such donors certified sperm donors.
In Japan, a meaningful share of babies are said to be conceived through fertility treatment, and many people struggle on their journey to parenthood. Sperm donation is one of the options available to them. Your cooperation can genuinely change someone’s life.
You can see examples of the donor profiles we publish on our registered donor list (Japanese).
Donors of all backgrounds are welcome
We welcome donor registrations from residents of Japan of all nationalities and backgrounds. Profiles with international roots — including donors of European heritage — are currently in especially high demand from prospective recipients.
You can contact us in English via LINE. If you live in Japan and are interested in becoming a donor, feel free to reach out — questions in English are welcome, and asking does not commit you to registering.
Who registers with us
"I want to help someone"
You know that some people long for a child but cannot conceive, and you want to support them in a way only you can.
"I want a safe framework"
Rather than private arrangements over social media, you want to cooperate within a system of identity checks, health screening, and written agreements.
"I want my privacy protected"
You are concerned about how your information will be handled, and want a say in whether your profile is published.
"I want to know what is involved"
You want to understand the registration process and how donations actually proceed before you decide.
Why register with a sperm bank instead of donating privately
Posts recruiting sperm donors can be found on social media and message boards. Private, person-to-person arrangements, however, carry risks for the donor as well — risks that are hard to see in advance.
In a private arrangement, you have no way to verify who the recipient is or what kind of contact may come after donation. If nothing is put in writing, disagreements can later arise over acknowledgment of paternity or child support. Some private recruitments also presuppose donation through intercourse, which adds the risk of sexually transmitted infections.
Registering with a sperm bank means acting within a framework of identity verification, health screening, and written agreements. It takes more effort, but that effort exists to protect the donor, too — by leaving a clear record that makes later disputes less likely.
Requirements for registration
- You can provide documents verifying your age, height, weight, blood type, and health condition (e.g. a health checkup report)
- You can provide documents verifying your occupation, education, alma mater, career history, and qualifications (e.g. employee ID, diploma)
- You can provide documents showing the results of testing for infectious and sexually transmitted diseases (test kit or testing at a medical institution)
- You can respect the recipient’s wishes regarding whether there is any contact after donation
- You understand that a new life may be born, and can sincerely support those hoping to become parents
- You have common sense and good manners, and can communicate responsibly
- You will not provide false information at registration
Regarding age: a recommendation by the Japan Society for Reproductive Medicine states that, considering age-related risks of sperm abnormalities, it is preferable for sperm donors to be physically and mentally healthy adults under 40 (the recommendation is written with treatment using donated gametes at medical institutions in mind). Whether you can register with us depends on your individual circumstances — please contact us first.
Health screening before donation
In sperm donation, the donor’s health affects both the recipient and the child who may be born. Screening for infectious diseases is therefore an essential step.
Tests generally cover HIV, hepatitis B and C, syphilis, chlamydia, and similar infections. Note that every test has a "window period" — a gap between infection and when the infection becomes detectable — so a single test is not always conclusive.
Your legal position as a donor
The question donors ask most is: "Could I be asked to acknowledge paternity or pay child support in the future?" We believe you deserve a straight answer.
A Japanese law enacted in 2020 (a special act on assisted reproductive technology and parent-child relationships under the Civil Code) provides that the woman who gives birth is the child’s legal mother, and that a husband who consented to his wife conceiving with donated sperm cannot later deny the child’s legitimacy. However, the law contains no provision defining the legal relationship between a sperm donor and the child.
The provision on denial of legitimacy presupposes a legally married couple, and does not cover every type of request we receive.
In other words, the law does not currently guarantee that "a donor bears no responsibility whatsoever." Putting the terms of each donation in writing between the parties is the practical safeguard available today, and that is how we proceed.
From registration to donation
1. Contact us / apply
Please review the terms of use and send us your details. Questions before applying are welcome — in English via LINE.
2. Confirmation and registration
After reviewing your information, we will guide you through the registration procedure. Any fees and details of the procedure are clearly explained when you contact us.
3. We contact you when a request arrives
Once registered, our office will contact you when a donation request comes in. Timing and frequency depend on your profile and the recipients’ preferences.
4. Agreeing on the details
We coordinate the specifics: whether there is an interview, and the method, place, and date of the donation. Whether you meet the recipient in person depends on the situation.
5. Donation
Donation is made by the syringe method or through a procedure at a medical institution. After that, you simply wait for the next request.
About fees and conditions
We do not publish uniform information about registration fees or conditions on this page. Details are explained individually when you contact us.
One thing we want to say clearly: sperm donation is an act that touches the life of a child who may be born. What matters to us is not the conditions alone, but whether you genuinely understand and accept what donation means.
Privacy
If you value your privacy and prefer not to appear in our newly-registered donor listings, let us know at registration. Even unlisted donors receive requests through our office. Whether and how your profile is published can be discussed when you register.
Frequently asked questions
Do I need to speak Japanese?
You can contact us in English via LINE — send your questions in English and we will respond. Please feel free to ask about any part of the process in English.
Can I donate through sexual intercourse ("natural insemination")?
No. We never arrange donation through intercourse. Donations are made only by the syringe method or through medical institutions. This policy puts safety first.
Is there a registration fee?
There are fees related to the registration procedure. Amounts and conditions are clearly explained when you contact us — please feel free to ask first.
I have never been tested. Can I still register?
Test results are not required at the point of registration. If you wish, we may be able to introduce test kits or medical institutions — please ask.
Will my identity be revealed?
The information you provide is strictly managed and is not disclosed to third parties without your consent. You may also choose not to be listed publicly.
That said, no framework can completely rule out the possibility of biological relationships being discovered through commercial DNA testing. Rules on handling donor information are still under legislative discussion in Japan, and we cannot promise what future systems will look like. Please consider registration with this understanding.
Could a child contact me in the future?
Whether there is any contact after donation is confirmed at registration, including the recipient’s wishes. However, the right of donor-conceived children to know their origins is still under legislative discussion in Japan, and we cannot promise what future rules will be. We ask donors to register with this understanding.
Can I withdraw after registering?
If your circumstances change, please contact our office as soon as possible. If a request is already in progress, we will discuss how to proceed, since the recipient is affected.
Can I just ask questions first?
Of course. Add us on LINE and send the message "Donor registration" — consultations at the consideration stage are welcome, with no obligation to register.