(I know it's probably not too significant and there are other checks in place, but I found it rather ironic when the text right above it happens to be "I try to be VERY VERY careful".)
When looking at his site from the point of view of someone who could be interested in hiring him, it certainly leaves a strong impression - but unfortunately, not a positive one.
What you do in private is nobody's business, but if you do it publicly ... this could rise a red flag for an US employer.
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.
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 ...).