Most gay porn I have seen features two guys who are similar to each other in size, age and general condition. My own preference is for seeing two guys who contrast with each other in particular ways. I like to see very cute, young twink boys making sex with guys who are a bit older (though not much), very muscular and hunky -- masculine men who are dominant tops. I love it when the muscle man rips into the young boy and leaves him raw and exhausted.
Does anyone here know of sites that feature such matchups?