I'd be willing to bet, if you checked enough towns, England, and even France, has old ridiculous sex laws on their books as well. A law that isn't enforced -- isn't even known unless you dig in historical municipality documents -- isn't really fair play for argument about what is or isn't allowed.
My point is that you can go out anywhere, any time, and find someone to have sex with, in any manner you want, and you'll get no societal trouble. You can have gay interracial multi-partner sex, and you won't be jailed, loose your job, or otherwise have a problem. In general.
Sure, you can find a way to get a problem from it, but the same is true of going to the toilet. No one has a problem with it, but if you go around telling your boss, "I just took the biggest dump!" they'll be some stigma attached to you.
This conversation even started with the acknowledgement of the common phenomenon of one night stand, casual sex. If things were as puritanical as you say, that would be a strictly secret activity. But it's not secret, or even concealed.
Sex is far from repressed in America. It may be less in-your-face than some other countries, but Saturn being smaller than Jupiter does not make Saturn a small planet.
Bullgrit