Was in a foreign country recently. The toilets were marked M/F. Walked in one door and my husband went in the other and they both opened into the same large room with sinks in the middle and fully closed cubicles around the edge.

Jellyfish reproduction involves both sexual and asexual stages, with most species releasing sperm and eggs into the water for fertilization. They can choose the toilet they want.

This has been one of my favourites since I was a kid. And thank you to the other poster for the added science fact!