Most of us went into having sex completely clueless and that just sucks because it's not that difficult to actually be educated and by that I don't mean middle school sex ed. It shouldn't be difficult to talk about and if you get too embarrassed talking about sex then you probably shouldn't be having it.
If you're having sex with someone, you should communicate with them. I know that sounds weird, but you can't just let them guess what you want. If you can't tell someone what you like, then there's no point in wasting your time being unsatisfied. Also, sex is not just about the guy. It shouldn't be over just because the guy is tired or done or WHATEVER. It's not just about him. Girls have needs, too! Sex is supposed to be a mutual thing. It's about two people and it's about BOTH of those people.
Whatever it is that you're into, you shouldn't be hesitant to share it. If you think it's sexy to incorporate food, then cool. If you're a girl that would rather have sex with girls than guys, that's great. If you're into handcuffs and whips, you do you. There's always going to be someone who's going to think you're weird regardless of what you're into but that shouldn't stop you from doing what you want. Your sex life is nobody else's business anyway. It's between you and whoever it is that you're having sex with and you should be able to be open about it.