I think I might be able to see the problem.
The site emphasises that it's "very against to the sexual life style" and not an adult site and so forth - meaning that the target audience is people who

i) want a serious relationship without any of that sort of sleazy carry-on thank you very much, and
ii) are prepared to post nude photos of themselves on the internet.
(apeloverage committed the vile act of onanism on, Sun 25 Jan 2009, 23:10, Reply)