How can you tell if someone has sexual disease?

How can you tell if someone has sexual disease?for ex. can u tell by looking at a girl's pus**if they have some sort of sexual disease...if its like black looking?

katlady
sometimes you cant tell. wear a condom!

moo
the only way is to have testing done. most sexually transmitted infections you can't tell by looking. The only one I can think of where you see something is if she's having a herpes outbreak, which looks like an ulcer. Otherwise, blood tests and vaginal exam/tests are the only way.

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