web development – Do I need Age Gate validation on an art website?

Hello fellow webmasters,
I'm a developer / webmaster for a painter who has nudes hidden in his paintings (it's a perspective trick). I built a website where you can discover the nudes hidden in the paintings by clicking on them. The nudes are "artistic nudes" but they contain images of totally naked men and women.

So, should I put an old door to this site?