In a nutshell, yes. If a 12-year-old girl goes in for an abortion, she's pregnant (though abortionists are known to perform 'abortions' on girls who aren't pregnant $$$) or has cause to believe she's pregnant, so she's had sex, and she's being abused. The age and age of partner vary from state to state, obviously. States have laws requiring certain people to report suspected abuse to authorities, since the state has an interest in catching, punishing, and preventing predators of young girls.
This would also include boys having sex as well, wouldn't it? After all, they have to have partners in their sex acts. Once the case is investigated by either social services or the police or both, then the name and address of their sex partner could be ascertained.