Cheating on your spouse is legal. A lot of people do it. Therefore, that indicates an acceptance by sociey.
Considering how people are buy their porn (in adult bookstores, through the mail, via the internet), I don't see the level of societal acceptance that you do. More like tolerance.
But if we've learned anything from the homosexual lobby, tolerance is but the first step towards acceptance, isn't it?
That's anopther one that will go over well at the NAACP convention and with his anarchist "fellow travellers."
A requirement of something being considered obscene is that it be "patently offensive." When a substantial percentage of Americans are doing something, it is probably not patently offensive.
Not in North Carolina. We have an alienation of affection law that provides the spouse that was cheated on legal recourse against the person their spouse cheated with, including suing for financial damages.