I agree...if either one of you isn't comfortable with something, I don't think it should be done. I don't think trading one uncomfortable act for another is going to be wise in the long term either.
Nothing at all wrong with trying new things, and indeed, it might be a pleasant surprise trying new things, so to speak. But if you have a limit, you have a limit. Mutual respect of each other's limits is a good thing to have in a relationship.
EDIT: God I HATE my campus internet!
I'll try to have a moderator get rid of the extras.

Sorry about that.