what's happening

i've been with my boyfriend for two years now. i'm almost 17 & hes 17. as her along perfect. we're so much alike, but when it comes to sex i just don't feel in the mood so much. i don't think he's sexy in that way all the time. i think he's adorable tho. i find myself somtimes thinking of other men while we're having sex and i feel so guilty. I dont know if i love him but just not sexually attracted to him anymore or what. someone help me decide ?