Ok, this works for me.
I'm straight, and it feels good, so if your gay, I guess it could feel better. I dunno. Try it and see.
Whenever I wank with my hand, I usually stimulate myself by inserting something up my anus, such as a HB pencil or the end of an old toothbrush. This stimulates the G-spot and causes huge and brilliant orgasms!!! For extra pleasure, look at something that turns you on or hump a pillow, sofa arm, your bed etc etc.
Although, you have to lube up first, otherwise it will probably hurt a bit, I usually use squirty soap (smells good and cleans up too!) or vasilene, but I guess you could experiment....
So there you are, happy wanking people!