Ok, shaving your armpits won't do a hell of a lot, and i's itchy for a while. But if you want to do it anyway, go for it. When you ask, is it acceptable for guys, who is going to notice if you do or not? No one. And if they do, they won't care.
Cumming too fast: Nervousness. That's the reason. Because you are posting this, it's obviously a concern of yours. And I would bet $100000 that when you're having sex, or ever ABOUT to have sex, you're thinking 'shit, I hope I don't blow my load too soon.' So you're already thinking about, which gets your brain working in that area, which WILL cause you to explode quicker then you may like.
Things to do:
- Have fun: Sex IS fun! Laugh about it, try new things, ENJOY IT! The more fun it is, the less nervous you will be.
- Think about something else: Now by this, I don't mean think about someone else. If you are feeling yourself getting close, try to distract yourself from this gorgeous girl you are entered in. Look around the room, see peer over and see if your bedside table needs dusting. Make a little jingle in your head about the condom wrapper on the floor.
And if all this fails, and you still come really quick, and the girl is left unsatisfied, get really good with your hands
Hope that helped matey.