I'm with herewego and Lizzylocket on this... emotional is worse than physical.
My ex had a problem with the zip on his trousers - it kept coming down in the presence of other women whenever I was away wih my job, which was quite a lot! It hurt a lot, but ultimately I knew that for him it was just a physical act, so the only thing I was concerned about was my health.
My OH and I both have close friends of the opposite sex who we knew before we got together. After we'd been together a few months we sat down and had a long discussion about what is, and isn't, acceptable to discuss with them. We agreed that a solid relationship means being each other's best friend, so the ultimate betrayal would be to find out that we were sharing our innermost secrets and fears with our friends rather than with each other.