Okay, so the best sex I have is when my partner and I are so in tune with eachother, usually when we're half asleep late at night, and it's just filled with passion. A lot of the time neither of us will ever finish, I don't know. We view sex as an energy transfer, or at least I do, and usually we will just go until we've given eachother all we have, we're tired, happy, and kiss until we fall asleep.

As far as what feels good, if you're not having a long term relationship, you're not going to reach mindblowing sex. It's all about practice and learning what you both like, and everybody is different. Give him what you have and if it's not enough for him, he's not worth sticking around for. If he's giving you enough and you feel like you should be paying him back, ask him what he likes. Don't just surprise him with things, ask him to show you or at least tell you what he wants. Sex is give and take, if you guys can't communicate there's no point and it's not going to get better. Give it time, just love eachother and the good sex will come with it!

As far as what hurts, if he has hair, be careful and don't pull it, and don't suck anything too hard. If you feel weird about it, he probably will too, so don't just jump into something new without any word, start slow and read body language.