I am very fortunate to not have this issue in my current long term relationship.
I did date a young man many years ago, whom I think I may have loved. He was a nice guy and really sensual, but clueless in the "Pleasing a Women" department. He not only didn't know how to perform oral sex, he didn't even try. He made insinuations that it was "icky." Yeah, he was dropped quickly.
I'm a very sexual person and I need good sex in my relationships, or it isn't worth the trouble.
I hope for the sake of the wife he has now (he's married with kids, as am I) that he learned the Ways of Love.