DovBear interviews Rabbi Harry Maryles. An excerpt of Harry's:
…My objection to the forbidden homosexual act is not so much to the fact that the Torah calls it a Toevah. It is more to the seriousness of the offense as a capital one. To that end, I equate it to Halachic adultry (a man and a married woman other than his wife). I consider them equally wrong.
But although I find homosexual acts more difficult to deal with emotionally, intellectually I think adultery is a greater ‘wrong’ (…for lack of a better word).
For a heterosexual, the sex drive need not be satisfied through adultery. There are legal ways to satisfy that drive. But to a homosexual, the drive cannot be satisfied in any way that is Halachic. Thus it is much more difficult for a homosexual to live a Halachic lifestyle than it is for a heterosexual. Transgressions by homosexuals should therefore get more sympathy, in my view, over transgressions by heterosexuals. But in this world, I’m afraid the opposite is true.…
Pretty much what I've written, as well.