Kenzie Kilpatrick, 26, has become the biological father of ten babies this year after advertising sperm donation through Facebook / Kenzie MrGrey Kilpatrick/Facebook

The man became the legal father of ten babies, including one set of twins, in the space of three months

A gay man set up a Facebook group to become a sperm donor to couples he met online for free.

Over the past 13 months 26-year-old Kenzie Kilpatrick from Birmingham has helped up to 50 women to get pregnant after meeting them on Facebook.

Mr Kilpatrick, who last summer created a group advertising "drama free UK sperm donor", said that he has mainly donated to lesbian couples.

After being contacted by dozens of women Mr Kilpatrick would get to know them online before meeting.

He would meet them at their homes or in hotel rooms. He would then provide sperm samples to be artificially inseminated in private using a syringe.

Mr Kilpatrick did not accept payment other than expenses for his services and said that knowing he has "helped people who have suffered for so long, desperately wanting to have a baby" has been his biggest motivator.

"I also feel incredible knowing that I will have 10 babies out there continuing my genes," he told the Birmingham Mail but said that he does not feel the need to know the children.

Mr Kilpatrick used social media to get to know the couples before helping them to get pregnant.

"Facebook is a wonderful thing," he said. "You go back through their timeline and you can see the information."

Although the donations were not anonymous, contracts were signed saying that he would have no involvement in the children's upbringings.

"Kenzie is such an amazing and selfless person, he has given us a gift that is truly priceless," one mother told the Daily Mail.

The Human Fertilisation and Embryology Authority, which monitors UK fertility clinics, has strongly urged people wanting to use sperm donors to use licensed clinics.

"While donor insemination treatment at a licensed clinic can be expensive, it offers patients a range of protections that people using an unregistered donor found via the web do not have," the HFEA said in a statement.

Clinics ensure that donors are vetted and are free from sexually transmitted diseases. Their system also means that by UK law the donor automatically has no parental rights or responsibilities.

When the sperm is donated privately then the donor is the legal father of any child born and the parent who did not give birth to the child will have to adopt them.

Mr Kilpatrick, who plans to co-parent a child with a lesbian couple, says he didn't go to a licensed clinic because they are "extortionate". "These poor couples have to save and save and save to get stupid amounts of money. It's just a business. That's all it is," he explained.