@Thomas,
I found that passage from Leviticus after I made that earlier post--I had plain forgotten about it.
And, I also did some reading, after I remembered about Leviticus, and it's not clear whether the prohibition in Leviticus is based on the fact that such behavior was considered "unnatural" rather than "sinful". There is a strong emphasis in the Torah on following "the natural laws"--violating "natural laws" is an offense against God. It's a little different than the Christian notion of "sin". By one man sexually engaging with another, he is not spreading his seed and multiplying, he is not following the natural law. That's probably why lesbian behavior wasn't viewed the same way.
And the prohibition against homosexual, or anal, sex may also have been based on hygiene concerns, at that period in time, rather than notions of "sin". The same sort of thinking is behind the prohibition against having sex with, or even touching, a menstruating woman--she is viewed as "unclean" and she has to go through a ritual bath after each menstrual period before an Orthodox Jewish man can touch her in any way. Orthodox Jewish men still avoid touching any woman they do not know, because she might be menstruating.
Talmudic scholars and rabbis endlessly interpret the Torah and debate this sort of thing--they spend lifetimes doing it.
And, while one of the Ten Commandments is about not coveting thy neighbor's wife, there is nothing about not coveting your neighbor's brother.
Currently, it is really only in Orthodox Judaism--the most fundamentalist branch-- that homosexuality is seen as unacceptable, the reform and conservative branches of Judaism really don't promote that view. But, Orthodox Jews also don't use birth control--which is why they tend to have large families--they still very much believe in spreading their seed and multiplying. That's the "natural law"--not wasting one's seed. Homosexuals are seen as wasting their seed.
Today we know there is nothing "unnatural" about homosexual behavior, it naturally occurs in animals beside humans, and it is simply a less frequent occurrence, or variant, of normal unlearned sexual behavior. So, personally, I don't feel that anyone should be bound by a view of such behavior developed thousands and thousands and thousands of years ago. But other people are free to think differently.
But, thanks for pointing out the citation from Leviticus, and the error I made in my previous post.