It is also statutory rape (at least in Massachusetts I hear, probably other states as well), to take an underage individual who meets the criterion mentioned above across state lines. Strange? The rationale there is that you could just drive to a state where the age of consent is much lower, and go crazy there. Smart, if you ask me.

It's only inforced like that in very rare circumstances. Of course if you are driving your 14 yr old niece across state lines to visit your grandparents, you have nothing to fear: there has to be proof or suspicion of sexual activity, as it is put together, I believe.

Thanks to Percepied for the additional info below.