As someone who is not from the US I am always amazed at how puritanical your country can be. Having said that I have always been curious (and somewhat unsure) as to what would actually constitute "sex" under US law?
Vaginal or anal....sure, I got that.
Oral (giving or receiving...AKA "Clintonian Sex"

) pretty sure that is too.
So, what about a Domme who aplies a Hitachi Magic Wand or a fleshlight to a restrained sub as part of the session finale? Serious question....illegal? legal? or "grey area" that no one talks about? I've played in the US quite a few times over the years and have never been 100% clear on this. Although, the couple of times a session ended on a wimper rather than a bang were in Canada rather than the US so who knows.
In deference to Mistress Tissa if this post is offensive please feel free to delete.