During sex my man won't take top?

Ann
I like being on top and all but it hurts after a while and by the time i get to the "ow ow ow!" stage were my hips and knees are screaming he says "we can stop having sex for a minute." Umm noo?! Why won't he take over top for a while. I don't wanna stop having sex i want him on top. I haven't had an orgasm in a couple months because of this.