At last ! I managed to create a community lot where my sims will be able to go to the sauna and massage each other. It is better to be friends with the stylist though, otherwise he/she won't massage you :/
This is a salon community lot and the terrain size is 20X20.
The sauna and the massage tables are included in the file.
The file size is 23 Mo.
WA, Ambitions, Late Night (maybe Pets and Supernatural for a chair and the curtains) are required.