The only way to know whether a girl (or a guy) is a virgin is by ASKING! There’s no way to tell whether a person has had sexual intercourse before by looking at a part of their body. If you’re thinking about having sex with someone, you should be ready to have an open and honest conversation about each other’s past sexual experiences before you have sex. Also, you should always use a condom regardless of whether or not it’s the first time for one or both of you. Girls can get pregnant the first time they have sex, and condoms are the only way to protect yourself and your partner from sexually transmitted infections.