Internet - This sexy experiment backfired big time! Following a hot night with his girlfriend and an acquaintance, this young man is now going to be a dad.

When user ThrowRAPregnantMF22, as the 22-year-old calls himself on Reddit, and his girlfriend agreed to have a threesome, everyone was looking forward to a good time.

After all, this wasn't the first time they'd done something like this. And what could possibly go wrong when their partner of choice was a good friend of both of them?

At least initially, nothing: it all went smoothly and the three had a lot of frisky fun.

However, only a few weeks later the man received some shocking news: the couple's friend was pregnant!

To his own surprise, his girlfriend didn't seem to have a problem with the situation at all. "My girlfriend said this is fine and she doesn't mind and I genuinely believe her looking into her eyes since she's a bad liar," he wrote in his post.

But what about the man? Is the 22-year-old ready for becoming a dad? And most importantly, is he ready for a baby that isn't his partner's?

"I own my house and make enough money to support the kid and my child's mother and us but I'm not sure! She wants to keep it and I don't really have a choice in this."

While there is no test result yet on whether ThrowRAPregnantMF22 really is the father, the expectant mother denies having had sex with anyone else during that time.

The 22-year-old turned to Reddit in desperation: "I love my girlfriend and care about her more than the world, but I also want to be there for my child and don't want to a absent parent."

While the post has now been deleted, thousands of Twitter users have since expressed their thoughts.

"Next time maybe think twice about your choice of protection," one user wrote, and another followed right up: "Def wait for that DNA test."

"Honestlyyyyyy this could be a setup for an adorable polyamory story or a complete disaster," a third one said.