i would never get tired of sex, you people are crazy. and paintitblack, you said you had done it in everyway, but arent aware of any fantasies he has? if you havent coaxed out something he absolutley loves when it comes to sex then there are lots of scenarios you have yet to discover in bed
how's your actual RELATIONSHIP? i mean, if you just care about the sex, and he doesnt at all, then maybe you two shouldn't be together. it happens, people get bored... either do something about it or find another guy. you're young, you shouldn't be hung up on such stupid things