“Where exactly in the US Constitution is the enumerated power for Congress to regulate sexual activity?”
Since when did conservatives support federal sex laws? So far as I’ve noticed, the issue’s always been the states’ prerogative to regulate sexuality. Which has nothing to do with the Constitution, except insofar as liberals misread it.
I'll find the poster whose tagline reads "as a matter of fact what you do in your bedroom is my business". You can ask him yourself.