I would assume most religions do condemn porn but mainstream US society is not religious.
Mainstream US society is fairly accepting of porn. The fact that it's joked about is basically evidence of this. Nobody jokes about e.g. getting caught fucking children, which IS condemned by mainstream US society.
The point is anytime somebody talks about having a problem with porn, there is some kneejerk reaction about how he is just confused by an unenlightened puritanical society, as if he is incapable of deciding for himself whether or not porn is negatively affecting his own life.
Only 17% of Americans are non-religious.
And only 19% of Americans say religion is not very important to them (including the 17% who are non-religious).
A majority, 55%, of Americans say religion can solve "all or most of today's problems."
Perhaps more pertinent, a minority of Americans consider pornography "morally acceptable." Even among Americans ages 18-34.
http://www.gallup.com/poll/1690/religion.aspx
http://www.gallup.com/poll/162881/older-americans-moral-atti...
Yes, as would getting walked in on having sex with a partner. But in which of those three cases would the joke be on the person getting caught?
> mainstream US society is not religious.
You might be filter bubbled. Most polls I have seen show at least 70% of Americans consider themselves religious.
> Nobody jokes about e.g. getting caught fucking children
Except for lots of comedians, and in fact, the humor comes directly from the fact that society shames the practice (rightfully so).