Obviously it depends on the person. I do agree for the most part it's hypocritical to object to seeing a friend/relative in porn when one is looking for porn, though.

My personal take on this: If I found nude or jilling pictures of my wife on the web it wouldn't bother me one bit. Hardcore would depend on the context in which they were taken--the pictures as such would not be an issue, but if they weren't amateur shots it would imply a casualness about sex that I wouldn't like.