As posted elsewhere, the Joe Gage and Titan movies where the actors before they have sex stare at the other actor's bits for minutes before going down.
I just wanted to comment on the spitting on the anal area. I have done it to a couple of people, but I sort of agree. If it is done for lubing (not for unsafe sex I add) that is ok but it does annoy me when the actor spits over and over. There was one scene I did not buy because the actor did it about 8 times yes I counted LOL and it ruined it.
If people like to watch or do that, that's cool but it's just a bit of a turn off.
Also
on face. It's an art but sometimes it looks so sexy and hot, but when it's under the nose or dripping off it's revolting. I have not to date seen this in gay movies but in straight movies when the woman has it in her mouth and blows bubbles is gagging.
Again, this is just opinion, but also depends on mood or how turned on I am.