The butt is basically the boobs of the lower part of the body so for gay men, the absence of boobs is not so much of a problem. The thing about butt cheeks is that they are perky and round, they look squishy and very hard to resist groping.
But, one of the men's most favorite is cumming on the ass cheeks of their partners. Then they also like to cum on the throat itself right after a good deepthroat, on the tongue about a handjob, on other parts of the body including inside the asshole itself. Among gay men, they like to cum on the face of their partners after receiving a good blowjob. And it may seem like a little thing but cumming in different places is a crucial part in sex. Men like to experiment where to cum-each body part gives a different kind of pleasure, a brand-new experience for each place. Cumminng in the ass is a popular act by gay men of porn or even in real life.