a friend of mine used to say "eating aint' cheating" (so if oral on a girl isn't cehating then i'm sure he woudlnt' consider oral on aguy cheating) it is, not matter what way you look at it... cheating is having relations with another person, while in a relationship. that includes anything that isn't strictly friendly (talk to a girl, that's not cheating, kissing her, fucking her, oral sex and any of that shit that involves closeness of any type, is cheating.)