I saw "Falsettos" this weekend.  Interesting story, written by a man who identifies as homosexual, in which a man leaves his wife and child for a homosexual relationship.  

He laments not having his family anymore, but he can't help himself to be drawn to the purely sexual "love" that he has for this handsome guy.  The show depicted the striking differences between male-female unions, based on procreation; and homosexual unions based on sodomy and appearance.  There was one scene in which the two guys were naked, one sleeping, and the  other singing about his "love" as he peeked under the sheet to look at his penis.  

Other homosexual films, created by homosexuals, depict similar perspectives.  Sodomy, sodomy, sodomy: the climax, so to speak, of "Brokeback," and the reason for "Philadelphia."