well, that would depend on what you mean by gay sex? Blow jobs, dead throating, taking it up the but, mutual masturbation > these are all forms of gay sex.
But if you mean up the butt, it would depend on if it was the first time, the kind of lube used, how thick the dick going in is , & if there was any stretching of hole prior to entry.
But after the first couple of times, it feels great.