He loves the power play aspect of controlling, dominating and overpowering me. When I "resist or try to make him stop", it really turns him on even more. He enjoys the humilation aspect of being able to take me from behind aggressively and with his force and strength. For me, he knows I get a lot of pleasure and enjoyment from this aspect, so we have wonderful chemistry together.
Mind you this didnt happen "overnight". It took time for him to know and understand my limits and boundries.