It's bad to tempt someone who's already in a relationship.
Ash has a crush on a guy at work, but she knows he's married.
Ash has to decide whether to hit on the guy.
Ash decides to leave the guy alone and doesn't say anything to him.
Ash tells the guy that she's really good at giving oral sex.
The guy's relationship is safe, and he doesn't have to deal with any temptations.
The guy's relationship is in danger if he decides to have sex with Ash.