Wiktionary
pink salon
n. A kind of Japanese brothel offering fellatio.
Wikipedia
Pink salon
A , or for short, is a type of brothel in Japan which specialises in oral sex.
Pink salons skirt laws against prostitution by serving food, operating without showers or private rooms, and limiting the services provided to fellatio. There may also be additional activities such as fingering the "companion" and sumata. They exist all over Japan and women who work in them may service a dozen or more men per shift.