Sticking this one to the US isn't quite fair. I'm originally European (now European-US) and my wife is Chinese. I don't know of any major culture which openly encourages sharing your love of porn.
There is a difference between encouraging and actively marginalizing someone because he watches porn.
I was born in Eastern Europe where nobody had a problem with you watching porn as long as you don't do this at work or in public spaces (schools, shops etc ...).
Sticking this one to the US isn't quite fair. I'm originally European (now European-US) and my wife is Chinese. I don't know of any major culture which openly encourages sharing your love of porn.