Is it art or is it porn?

As a general rule anything that makes my dick twitch is porn. However, using that litmus test that time I was watching Gilligan’s Island and got a raging hard-on for Mary Ann would make that porn, so, it’s not a perfect way of telling what is porn and what is not.
Femjoy does erotics, but they’re almost so pretty I want to call them art. These photos while getting me horny at the same time gets me appreciating the artistic nature of them. Art porn? Erotica, I guess that’s the term I should stick to.