What do I do about completely opposite sexual desires?

My fiance' and I have been together for a year and a half, i'm 20 and he's 25. I'm a very sexual person and really enjoy the intimacy and romance of sex, not just the physical side. My fiance has little interest in sex and no interest in any kind of foreplay. I on the other hand enjoy everything to do with sex. He has never given me oral sex, and he's rarely interested in receiving himself. Sex is always in the same position in the same place. No spontaneity at all. He is very closed minded about exploring other positions or any foreplay. I can never initiate sex or try to seduce him because he laughs (he laughs when he's nervous). Not even talking dirty, or a dirty text message. He doesn't like lingerie and wants nothing to do with sex toys. Do you think this is a sign of inexperience or immaturity? I truly love him and this is the only negative in our relationship. Please help because this has become the only thing we fight about and I feel like we aren't going to make it because we seem to have such opposite interests.