A friend become so emotionally distressed after breaking up with a guy she slept with that she couldn't drive.
A friend who slept with a guy who said he'd "sleep with anyone who wasn't five hundred pounds", & was then upset that he was just using her as a fuck buddy. Then she hopped across state lines to sleep with a girl who she's interacted with in person for a total of about a month & then couldn't understand why things completely fell apart in about three months' time. Even after all this, she claimed that moving fast made her relationships more secure, so she slept with a guy who was coming from out of the country for school, found out she wanted little if anything to do with him, but wound up pregnant.
A family member slept with her boyfriend who couldn't handle being apart for more than 24 hours & was shocked when the relationship became heavily focused on sex. They broke up & he was an emotional mess, but they decided to be fuck buddies. That eventually ended & now they are hardly even friends.
A coworker was used for housing & food by two different guys she slept with within weeks of meeting them.
A couple slept with another woman who then wound up pregnant, had the baby, & left him with them when she left the country.
A couple agreed to allow each other to sleep with other people. He moved in with another woman & divorced the wife.
I'm told these are healthy, positive relationships. If that's true, I don't want to ever date.