Ever heard of euphoria? Do you know what happens when our body feels pain what does it do? it releases certain chemicals to overcome the pain. They are called natural pain killers (endorphins) and they take you in the third dimension.
I once asked one of my friends who was Gay and he told me that Gay Sex is much more pleasurable than straight sex as the area where it is practised has lot of nerves and .......etc etc (omitting the gory details)
he also said that he has practised straight sex but nothing beats gay sex as the sensation is on another level.

(I dont care whether people have straight sex or gay sex as long as it is consensual)