Why do guys always want sex?

Because of the male hormone Testosterone. That is what makes them horny and women have it too just not as much.

I know most of you think all or most guys are perverted so i just want to say this girl that I barely know asked if she could give me a bj and I told her no and to pretty much not to talk to me anymore so it's not alwas the guys. I wouldn't have sex with a girl unless I've gone out with her for a long time, I love her, and she asks me to. P.S. If a guy is hard it doesn't exactly mean he wants to have sex either because sometimes it just goes up randomly, especially in the morning I'm not sure why though I think is because we have to go pee.