cherokee69 is technically correct of course, but my understanding is that what they mean is "adult," which in the USA means "18 or older." It does seem a bit odd when the galleries here at Rendo are Breast City Central. What would be helpful in defining this would be for them to specify exactly what age level they're referring to. The recent controversy over deleted links to Gay Poser Art was really ugly, because people were confused about whether Renderosity was being homophobic (I really doubt that but don't know) or if it was because GPA was an 18-and-over site. As has been said repeatedly by others, the matter is further complicated by the presence of morphing genital props and bondage gear in the RMP.