9/10 people have oral herpes, you just don't get breakouts. I'm sure a lot of people have genital herpes too but never get breakouts. It's like freaking out that someone had chicken pox once.
You can also sleep with someone who has genital herpes and not catch it if they aren't in an outbreak.
Please stop spreading this myth.
It's 100% true though, if they're managing it with medication too.