Name: Syphilis

How You Get It: You'll catch syphilis from direct contact with a lover, acquaintance or trick's infected sore. So, if you see anything suspicious on your fuck buddy, well, buddy, you're better off avoiding that particular region. Be sure to take a close look at the penis, vagina and rectum.

Gory Details: Syphilis may be the goriest of our STD selection. This bacteria-born baddie causes open, puss filled and extremely unattractive sores. In addition to being nasty, syphilis can hide out for months and then pop up out of thin air. When it does, the disease will most likely appear first as small, seemingly innocuous bumps. It will, of course, get worse and become an itchless rash. You may also get a fever, hair loss, sore throat, aches, pains and swollen glands.

If left untreated, syphilis can go after the internal organs, causing blindness and, in some cases, insanity.

How You Kill It: Most strains of syphilis can be cured with a large and painful shot of penicillin. You can also prevent a syphilis infection by using condoms and, again, avoiding other people's open sores. Neither tactic, however, guarantees immunity.