Société-X runs members-only erotic events in the Netherlands — four premium nights a year at different locations, with trips, dinners and sensual workshops in between. It describes itself as an exploration of hidden passions, sensuality and seduction.

Entry is by membership and the guest list is selective: couples or single women, no single men, and the organiser advertises that its members are 100% verified. It says members browse, chat and meet through its community before the night itself.

It is direct about a misunderstanding it evidently meets often: the events are not, in its words, a huge orgy you have to take part in — it describes them as relaxed and stylish, with dance and lounge areas, live music and erotic acts, where nothing is obligatory but everything is possible.