Why is my boyfriend always wanting this?

Well...I was talking to him on the phone lasntight and he said "Hey baby, you know...we should plan something out this Friday, ok?" And i was like "Yeauh, okay.." and hes like "Well..don't get mad, but..we should have like..a sexual day on friday, like..touching each other, and trying to moves out, for sex, and thers nothing wrong with that, right baby?" and I was like "Uhm...well, I don't really wanna do this kinda stuff" hes like "Well honestly, i wanna do this ..okay ." but jeez..I dont like it when he always wants to you know have sex, or do that kind of stuff..why is he always wanting to do this kinda stuff?? and when we go to bed together sometimes, he starts touching me on my middle area, you know. , and when im asleep, he'll try pull down my pants, and put his..you know what in me, from behind. then im saying "Stop, okay..I dont wanna do this, please, just stop" and hes like "Whatever..you said you'll do anything for me" and he'll just turn around on me, and sleep the other way. why does he always want this, or wanting to do this kind of stuff?? please answer .