
1. Life is too short
Let's be honest. We don't know what the future holds and who knows what is going to happen tomorrow. Life should be enjoyed everyday, and if you're not enjoying the sex- then you can do better. It isn't about the size, it's about the effort put into it.
2. If he doesn't care about your pleasure, he doesn't care about you
A guy that doesn't care about whether you cum, or whether you're enjoying sex, is a guy that cares more about his pleasure than you. Think about it in terms of the relationship. It can start off small, but if he doesn't try to please you in the sack, what are the chances he will try to please you emotionally, mentally?
3. Try and you will most likely succeed
All it takes is trying. Even if you see that his effort is great, or that he is willing to learn from your advice on what you like and don't like- unless you try you won't know whether you can succeed. A guy that gives up right away is not worth your time.

Most Helpful Guy