A: Wow, most people that answered this are pricks. The reason she's insecure about your guys night out is that she thinks you'll cheat, or she's just clingy. (Which isn't a bad thing ladies) (Sometimes)
A: Dude, you might think it's not bad, but sharing it here could prove a better understanding of the situation. You're already anonymous so go ahead and spill it.
A: Sadly, most guys find more enjoyment out of that than girls. When you find the rare guy that would rather do something else than screw, hold on to him.