To be fair, i can also be a a gay Taliban sometimes, and get riled up at the mere mention. It's not that much of a stretch to see at least a hint of homosexuality in the card, as it is a part of cultures past and present. While I wouldn't see the card as indicating someone is gay, I can see subtle hints to stories and mythology. Although later commentators tried to purge the idea, I think it's fair to say, through modern eyes, that Jonathan and David were at least bi-sexual. Apollo has been mentioned in this thread before, and one of my favorite stories from Greek mythology is that of him and Zephyros, which was anything but "brotherly love." One of the two origin stories in Genesis hints at the Greek idea of beings with two sexes.
Indeed, in Greece homosexuality was practically part of the system, with students expected to "inspire" their older teachers with their beauty, while the teachers were supposed to serve as strong role models. In ages past, I don't think people saw love between men as "something else", but as another way of showing "manly love" (Incidentally, the roles were strict; older men were tops and the young boys bottoms, but I digress). Then, of course, Christianity came along and spoiled the party, but I could see hints of that past displayed in several cards, even if not overtly, especially in the older decks. Still, I could imagine it to be a courageous act, to paint something like that, since if people then got the same associations we get, I can't imagine how they would react.
If it is, I don't know exactly how it could relate to the Sun in its meaning, other than the obvious double-male-sun connection. Perhaps a duality of the one kind of thing, I dunno. Like LRichard said, the genders are usually interchangeable depending on the circumstances.
As an aside, though, I might say that bringing up the Decameron is a moot point; it could hump anything, and usually does.
