Why is he hard all the time?

So there's this guy, he spent the night with me, and we would just finish doing whatever and he'll get hard like 5 minutes later.. So my question is, do I turn him on that much to make him hard that often? Or are guys just horny 24 7?

It's normal - especially if he's a young guy. Men can get an erection from anything - thinking about sex, a sexual movie or video, hell even a good cheeseburger can give a man an erection.

Honestly, be happy and enjoy it while you can. When men get older, some of them have a hard time getting hard again after sex.

My boyfriend is that exact same way, he's like I cant help it, you're just so damn sexy because I'll be laying there with him in my bra and panties. I think it's just because he's a male and is horny all the time.
I kinda like it though, like Mandyloo said, enjoy it

Dang I wish my girlfriend would stumble apon this lol .
She always things im horny all of the sudden.

Mandyloo is correct I am a guy
and just out of the blue a guy can get a boner.
Does this mean there horny...
No
it just means.
They have a boner its almost like a Muscle Spazum it just happens that or a charile horse w.e you want to compare it to

yup, pretty much 24\7 lol