Though I have to say the recent posts put me in a much better mood. Been thinking about it for a week now, and finally had to point out that this thread is a sin.
For those who made it past the old testament (and all the laws about 'natural behaviour' being discussed above), it kind of goes in a different direction.
Romans 14 (in a really roundabout way) discribes Jesus' teaching nothing is evil or unclean of itself unless it upsets or harms others. By that reasoning, I suppose you could say homosexuality is a sin, because it makes some people uncomfortable. But it is only a sin by the judgement of man, not God, and by the same token, saying it's a sin just because you have a right to also offends people and does a lot more harm to them.
Heh. Religion upsets and harms me. Oh, what am I to do?