I am not in agreement that the Gospels do say it is wrong. The quote in Corinthians gets translated differently in more recent translations. (The more recent translations are not attempting to make things more politically correct [not all of them, at least]; they attempt the truest translation possible of the original language(s).]
The Deuteronomy verse gets translated differently, too.
So we are left with Leviticus. I do not think there is any place where reasons are given for why it is an abomination to lie with a male as with a woman. Bear in mind, though, It is listed among the myriad other do's and don't's . . . like offering sacrifices, eating only animal with split hooves who chew a cud, eating only fish with fins and scales, no tattoos . . . and various guidelines on how to treat your slaves.
It's pretty much in our nature to know that lieing, stealing, and cheating are all wrong but there's no explaining why homosexuality is wrong. It just makes everyone confused between what they feel is right and what someone is telling them si right. The homosexual's feel something different inside but everyone is telling them its wrong, its wrong, why? How could god make you gay and then tell you its wrong? Their not harming anyone. When it comes to homosexuality doesnt it sound like god is saying ignore your heart, just do exactly what i say and everything will be alright. Doesnt sound loving to me.