One thing that hasn’t been mentioned is the thrill of the “conquest”. Something you don’t get with a prostitute (although I imagine some people might find the associated risks exciting as well).
That is sort of what I was asking about in my thread about gay sex. That is ass backwards (no pun intended) to the way most straight relationships work. It would be great if they did though. 
In most straight relationships, sex is something you earn over time and can lose the privilege for if you are deemed unworthy for any reason at any time. The romantic and “togetherness” aspects can happen but really, how can you expect the fireworks to hold when you have done the same thing hundreds of times already with the same person in the same place on the same bed? Sometimes you just want to bust a nut and not engage in any deep spiritual practices.
To get laid.
Seriously, though, the ev-psy reason I have read is to form bonds between people that help keep the tribe together and surviving. Humans are a hyper-social species, and sex and all the emotions that go with it (including negatives like possessiveness, jealousy, etc.) add to social cohesion.
There is no way to “prove” that the above is true, but it does make sense. The constant need for sex requires us to relate to each other and stay near each other instead of going off into the woods and living a solitary life like a bobcat.
Or to generate fake letters to advice columnists? (At least, it sounds fake to me. How many times do you have to be turned down before you realize you may be doing something wrong? :smack: )
No, that’s not at all what you were asking about. You were asking whether gay men think of the anus the same way straight men think of female genitals. And the answer was, for the most part, no.
Then try doing something different. It sounds like your concept of sex is way too narrow.
I’m fucked if I know.
Because it’s there.
-George Mallory
To confuse the pets.
Because there is nothing good on TV. And if there is, well, that’s why doggy style was invented.
Literally!