i need some sex advice?

ok so im seeing this guy hes not really my boy friend were more like f*ck buddies that's how i wanted it but any way at first when we started seeing each other things were good he made an effort in our sex life and now he doesn't, all he ever wants really is a bj and could care less about my needs and when we do have sex he wants me to do all the work. he is a bigger dude tall and wide with not the biggest penis in the world and im a curve girl so some sex positions can be hard for us. like last time he came over we did cowgirl but he is wide it kinda hurts my legs to be spread open that wide.he does work a lot so he is tired all the time but its starting to make me mad that he makes me do all the work i want the guy to be in control lol, does any one have any advice like some sex positions that we could try or something that i could do during cowgirl to do it better.oh and i like positions that are fast and hard but ill try anything ;)