There are few things more confusing than having bad sex with someone you’re extremely attracted to. It is possible to recover from bad sex without making either party die of embarrassment in the process. “Bad sex” is a fairly useless diagnosis, because it can mean approximately 700 different things. You probably don’t need to tell them the sex was bad, by the way. Not orgasming doesn’t automatically mean the sex was bad, just as orgasming doesn’t automatically mean it was great.