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An American man has spoken candidly about the "weird as f***" thing he caught his girlfriend doing after they had sex, which he says has left him feeling "nervous".

The boyfriend revealed all in a shocking post on Reddit, where he asked for some advice about the bizarre incident.

The unnamed man in his late 20s, claims he nipped to the bathroom right after having sex with his girlfriend and it was at this moment that things started to take an unusual turn.

(Image: Getty Images/Cultura RF) (Image: Getty Images)

In his post he says the woman "screamed" at him to find out what he was doing in the bathroom.

He thought this was odd, but made a joke of it before returning to the bedroom.

However upon his return things went from bad to worse, as he caught his girlfriend "stealing sperm" from the used condom.

(Image: Getty Images/iStockphoto)

He explained: "My girlfriend and I are both late 20s. About an hour ago we had sex. She is not on the pill so we use condoms.

"I had just finished and I went to the bathroom after that. She screamed at me to the bathroom 'peeing or pooping?' Which I thought was weird as f***.

"Jokingly I said 'pooping' but really I was just peeing.

"I came back into the bedroom and found her pouring the contents of my used condom inside her vagina. I'm nervous as f***."

The man then went on to ask whether this was legal, what happens if she gets pregnant as he did not consent to her doing this and he also wanted to know whether he owns his sperm.

He then admitted that he had tried to take the condom away from her, but she began shrieking so he had to back off.

People on the site were appalled by the woman's actions and warned him to stay away from her in future.

One commented: "Cut her out of your life immediately. Do not contact her in anyway. If she claims to be pregnant demand a paternity test."

Another wrote: "It's not against the law, you had consensual sex with her."

A third replied: "Apart from all the other good advice about getting her out of your life, call Planned Parenthood and ask them about the likelihood of her getting pregnant via this method."