Why does a guy's penis twitch/flinch?

Just wondering. It happens quite a bit.
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Most Helpful Guys

  • Excitement makes it flinch. When a man is getting an orgasm his penis flinches during the orgasm and seconds after it.
    It could also be the guy who's making it flinch.

    • Sometimes he does it on purpose.

    • Guys can make it flinch? Cool. How though? Is it like a kegal exercise for men?

    • I don't know why we do it, but I also sometimes flinch it on purpose, it's funny to watch, and if it's in front on the girl, she'll find it funny too xD

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  • His penis is reacting to being excited by flexing. It's the human male equivalent of a dog waging its tail.

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What Girls & Guys Said

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  • I sometimes have fun flexing my muscle when I am bored. I can make it twist in circles. I have tried putting small weights on it and flexing and that can be an equally fun way to cure boredom. I don't think it has made it any stronger though...

  • that is so cool :O

  • I don't know the biological reason why it happens , but it happens when its recently been stimulated or we are insanely horny.

    • Thanks.

    • To answer your comment on someone elses opinion. Yes its a good thing! Its a sign of intense pleasure similar to your vaginal contractions.

  • Because there's blood pumping through it at whatever that guy's heart rate is at.

    It's actually kind of fun to watch.

    • It is. Is it a good or bad thing?

    • If it's not twitching slightly, then the guy is most likely dead. So it would be a bad thing.

  • I think it's an involuntary reflex.