Has your sex drive fluctuated?

I have a perfect boyfriend who is a gentleman, respects me and he is attractive both physically and mentally to me. But for some reason I haven't been that into sexual touching. It's not because I'm not attracted to him but I just don't feel like having him preform activities on me or vice versa... I really love him and I don't know if this is normal... (I'm not pregnant because we have made the decision to stay virgins till we are 18 and able to support ourselves) thanks:)