Snu-snu is a made up word that means sex. In the episode “Amazonian Women in the Mood,” the crew goes to a planet inhabited by only super tall, muscular women who don’t often see men, and they want to have snu-snu with the men of the crew. They are dressed similarly to the woman in the original post.

The show writers used snu-snu to refer to sex without using the word sex. It’s essentially a censorship work around.