Yes, of course there is. Just like any other medical sample you have ever given. Blood, stool, urine, swaps...

But also all the unintentional donations: Every pubic hair you lost on the toilet seat, every tampon you disposed, every bandage you ripped off and threw away, every mattress you slept on, chewing gum you've spit out, every ejaculation, every ... you get the idea.

That's why you need laws to regulate this.