Um eww.

Bachelor and Bachelorette insiders reveal, in a new tell-all about the series, that the top reason prospective contestants get turned down is because of STDs, specifically herpes!

"As soon as the medical tests came back, you’d see that herpes was the biggest thing. Sometimes you'd be the first person to tell a contestant that they had herpes. You’d be like, 'Uh, you should call your doctor.' Why? 'We’re not going to be able to have you on our show, but you should call your doctor," staffer Ben Hatta explained in the new book Bachelor Nation: Inside the World of America’s Favorite Guilty Pleasure.

"Then they’d realize they'd been denied from The Bachelor and now a bunch of people knew they had herpes," he added.

The rules were a little more relaxed when it came to contestants' mental evaluations.

"There’s a window of the pass, do you know what I mean? You’d know there’d be a possibility of [someone] being kind of unhinged — like, she passed, but just barely. You can see it at the casting events during the interviews, 'Oh, this chick is going to go ­f–king nuts. She’s amazing,'" producer Michael Carroll revealed.

This makes sense. You can't have girls going from the Fantasy Suite to the gyno without a lawsuit on your hands!