The best way to protect yourself from STDs and pregnancy is by her being on the pill and him wearing a condom (apart from abstinence of course). It's important she takes the pills the way she's supposed to and that he wears a condom that is the right size for him. Otherwise it can break or slide off. It can also be clever to take STD tests if you have been sleeping with someone else. Herpes blisters are located on and around the genitals so condoms aren't always protecting against that.
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