Joe considers himself to be a sort of Superman, except instead of flying around saving lives, he travels the UK making lives. Joe is a free sperm donor — that is, he has sex with women free of charge in order to impregnate them. While the service may sound a bit unorthodox, Joe claims he’s conceived more than 30 offspring and is far from the only man to tap into this hot business.

"Joe," who like Superman, chose to keep his identity a secret, jets around England to impregnate women through "natural insemination," the Daily Mail reported.

"I have a Clark Kent life. Then, I have the Superman life," Joe told ABC News' 20/20. "People might want to have millions of dollars in the bank, and then, you know, some of us might want to have dozens of children out there."

Surprisingly, Joe is married with three legitimate teenage children and also makes a living as a successful Internet entrepreneur. As for his side venture, business is booming because Joe estimates that he has slept with close to 100 women via his service. Mr. Generosity wanted to make one thing clear about his service, however.

“I’m not having intercourse with these women when there’s no chance of pregnancy,” he explained. But unless he has the superpower of seeing into a woman’s uterus and knowing an egg is present, we’re not exactly sure how Joe knows when there is and isn’t a “chance of pregnancy.”

His reason for wanting to offer his DNA free of charge? "I'm unable to have as many children as I want in my relationship. … I have the satisfaction of knowing that I have another descendant out there."

Kyle Gordy is another British "free sperm donor" who likes to deliver his product the old fashioned way: sexual intercourse. At 23 years old, in the middle of a Master’s degree in finance, and with a nuclear engineer for a twin, it’s clear that Gordy could get a fair price for his sperm if he did choose to register with a sperm bank. Still, the young man seems genuine in his desire to simply pass on his charming good looks and impressive family IQ.

“I'm passing on my legacy and giving these people kids,” Gordy told ABC News. To date, the boyishly handsome man already has one child born as a result of his unconventional sperm donation.

ABC News actually got the chance to speak with one of Gordy’s clients, a 44-year-old never-married insurance broker named "Serena," who always wanted a child but didn't have a chance to have one.

“Always, since I was a very young child, and sometimes career and life just gets in the way,” Serena said. “Then oops, I'm 38. Oops, I'm 40.”

Like many other women in her situation, Serena was unable to afford the exorbitant prices most sperm banks charged and sought Gordy’s help out of need.

“I felt that there's maybe no other alternative for me,” Serena concluded, explaining that to her Gordy is simply a friend doing another friend a favor.

The practice, though perhaps unorthodox, is completely legal and quickly gaining followers, such as Free Sperm Donor UK, which has over 2,000 members. Although it’s not often in the news, it’s most definitely not an uncommon practice for men to have sex with their female friends who wish to become pregnant. What sets this free sperm donor situation apart is the fact that, ultimately, you are having unprotected sex with a complete stranger.