Stub Out Butts
Cigarette toxins can cause cellular damage that leaves you more vulnerable to infection and can make existing STDs much worse. Women who have HPV and smoke (or used to) are about two to three times more likely to develop cervical cancer than infected women who've never smoked. Oh, and by dulling your immune system, cig exhaust makes all STDs harder to treat—and thus easier to spread.
Beware the pHunk
The vagina's natural pH (a.k.a. its acidity level) keeps your lady parts safe by slaying invading bacteria. When your pH gets wonky, though, your risk of getting an STD increases. Stay in balance by avoiding pH-disrupting douches and scented tampons.