I doubt a gay man's first experience would compare to an as-yet straight man, curious about homosexual intercourse.
I know a girl who, for most of her life was straight, but just recently got it on with a lesbian friend (who was happy to oblige) and she said it actually felt similar to sex with men. Like, the tools are different, but it's essentially the same sport.
I can't relate as I was never curious about women, and probably never will be. But the basic truth seems to be, it basically come down to want you want to grab and see and feel.
I suggest (if you are single and free to do so) finding an appropriate person and explaining your situation and see if they're game to show you some things. There are quite a few gay men who for some reason carry a straight man fetish, so you won't be short of offers. As such you have the luxury (and obligation) to explain first and see if they're game. Don't just "go on the pull" and wind up chatting someone up who in hindsight isn't into "being sexually patient, with a curious straight gay".
Also, of course if you are in a "regular" relationship or a traditional marriage, then your curiosity must remain that; a curiosity. It doesn't matter how sexually curious you feel about things, sudden gay urges does not excuse you from being unfaithful. So if you are in that situation, you either need to wait until the next time your single, or if married, talk to your spouse about it.