We certainly don't intend Cake to be puritanical. Positive and respectful discussions about sexuality would be welcome here.
Nudity gets tricky though. Obviously not all nudity is sexual or meant to titillate, but the line can be very narrow and hard to define. One person's art is another person's porn. And if a platform isn't very, very careful, boundaries tend to get pushed, and then violated, and this can have an exclusionary effect, driving away people who don't want to be exposed to that kind of content and attracting only those who do.
That's why we want to be very careful about this. It's not out of a desire to enforce puritanical norms or anything. I foresee a lot of tricky judgement calls in our future, but I really hope we can navigate them without needing to make silly context-free rules like Tumblr's new "no female-presenting nipples" policy.