I am happily in a long-term relationship, that will very likely soon lead to marriage. We have been together for 5 years and while I have had relationships and sexual encounters outside of this relationship, he has not. He has had girlfriends and minor sexual experience before me, but not sex. I have been his only one. I am worried in the future, he will regret not being with other women. I think this is more of a guy thing, but can I really do anything about it? He had many chances before dating me to experiment, but chose not to. He says he is fine staying with me as long as sex stays interesting, which it always is. Do I have something to worry about or should I trust that he will not regret being with only me…