2. A person who gets checked for STD's in-between relationships.
Jeff G. is an anti-STD. He is celibate right now. After he is celibate for 3 months, he'll get tested.
Why wait 3 months?
It takes 3 months for most STD's to be detectable. If you just caught an STD yesterday, and get tested today, the test will say you are clean, even though you are not.