11 Jun The rationale behind the two recent studies discussed here (Pham & Shackelford , ; Pham, Shackelford, & Sela, ) is that human interest in performing oral sex evolved as a way to test if one's partner had recently been unfaithful. This notion, initially proposed in a book, is based on the idea. No matter how you look at it - oral sex IS sex and it IS still cheating. If there is any kind of intimacy between 2 (or more) people when any one of them is in a relationship - then it IS considered cheating. As for an earlier post. Someone said that if a man wasn't getting it from his wife then it wasn't considered. 19 Apr Now, I don't even want to touch or kiss my wife anymore. I loved what I thought our marriage was, now I don't know what to think of anymore. Of all the people in the world, I never thought my wife would have ever cheated on me. tl;dr- found out my wife had oral sex with my roommate in college.