Actually let me elaborate a little on the reason you see scattered porn on those sites. They are very popular and pretty much they are serving videos all day long. Those videos eat up bandwidth and for a site like this it is no big deal but for a site that deals in videos they have major bills. The fact is, porn pays the bills at those sites, so you kinda have to take the good with the bad if you know what I mean.
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.