Botticelli modeled the venus in his painting the birth of venus after ,or modest venus who chastely covers her genitals with her hand

The right answer for this one is a

Answer fiction;

Ithink it is more of an artistic statement, because clothing featured in these photographs and magazines is so extravagant that most people would not be even tempted to wear it, let along purchase it. 

They are not affected because the paint drys with the plaster on the wall, effectively making the fresco part of the wall.