They aren't very touchy feely verses I'm afraid, but:

Leviticus 18:22, 20:13
1 Kings 14:24 (some people don't believe this one applies)
Romans 1:24, 26, 27.

There are others. Many liberal Christians believe that these refer only to homosexuality done in observance of a pagan rite of some sort. Obviously there is disagreement with this interpretation among conservative types, and a lot of people who don't really know.