Obviously you're not doing it right then dude. If a girl's on top and grinding you all you gotta do is just lie there and stare at her tits wobbling around til she comes!
... Seriously though, grinding in-game sucks, but at least there's less chance of a messy finish.
Yes, I have gone mad. I'm also on a break from working at the moment... and I smell like shit. Fun

I love you all. (moreso Gus than anyone else)