Sex and the law is about what kinds of activities are allowed when it comes to sex, and how old you have to be before it's okay. Basically, it's against the law to do certain kinds of sexual activities with someone else if one of you is too young. For example, the law might say that you have to be 18 years old to agree to have sex with someone. That means if you are younger than 18 and you try to have sex with someone else, it's illegal. It also may be illegal for an adult to have sex with somebody younger than 18. Other activities like kissing and touching are allowed if both people agree, but that also depends on what the law says. The law is different in different countries, so it's important to make sure that you know what’s allowed in your country.