This website contains age-restricted materials including nudity and explicit depictions of sexual activity.
By entering, you affirm that you are at least 18 years of age or the age of majority in the jurisdiction you are accessing the website from and you consent to viewing sexually explicit content.
I can’t recall having ever seen it written down so I just assumed it was another French word/phrase bastardized by anglophones. It’s a reasonably safe assumption but certainly has its failings.