every so often we experience some chemical reactions inside of us that make us wish for contact with other beings of our same nature to get in the same act that serves as a way to preserve our species, and our personalities suffer subtle changes that favour that to happen
after that we return to our usual (and sometimes shyer) self until time pases and the cycle repeats
We’re actually quite unique. Most mammals don’t have menstrual cycles, they have estrous cycles. And the erectile penis is also unique. Most male mammals have penis bones.
The wiki pages for “Baculum” and “Menstruation_(mammal)” where quite interesting, thanks!
Not quite the most unique thing about us, but we’re in rather small club with some pretty cool mammals!