Is it normal to get a...

That's what grinding is - it gets each other off.

I thought it only works like this if you're grinding against an old man??

LOL If you're grinding and the girl reciprocates, there's your answer, grind away!. I've done a crotch to crotch occasionally with a hot guy who was very attractive, felt his hardness, got wet myself, and a good time was had by all. No prob!!

Sure, unless you're a llama :-S

nope its only normal to get a boner when grinding a dude

It's not normal if you like owls.

Of course it's normal and the girl should 1) expect it if she's grinding with you, 2) be flattered that she can turn you on and get you hard. Chances are that's what she was trying to do in the first place. Also, chances are that she's just as horny as you (especially when you have a boner). One way to know if the girl you're grinding with is okay with it or even really into it...if she carries on grinding when you're hard. If she's grinding on your boner then she doesn't care and is probably enjoying it. I would've thought that much was obvious but I though I'd say anyway. Happy grinding.

yeah, bro. Yeah

I get a boner with My brother in laws mother She is so hot she hugs. Me close I grind my bone in her crotch , The smell of her perfume my dick gets so hard I always brush. My hand across Her tits I end up going to the rest room and Jack off