I look at it this way, These parents are not paying me to be a babysitter... let them look after their own kids...
Besides, if you cannot tell by my URL  "Erotic Skins"  that there may be nudity on the page(s) then I do not think a warning page would help...... 
Oh wait... I am not a TGP  LOL Still.. parents need to take more responsibility for their kids and stop relying on everyone else to do so.....