I think you need to define nudity and semi-nudity more.

1 - No nudity detected people fully clothed. 2 - Semi-nudity detected people fully clothed. 3 - Nudity detected private parts/gentials visible.

How can there be semi-nudity if people are fully clothed? Are female breasts considered nudity or semi-nudity? What about male breasts? What about pubic hair without display of genitals? There are so many gray areas you need to be more specific.