Eroluna is an erotic-events agency from Filderstadt near Stuttgart, run by pro4you Event GmbH, which has been building themed erotic evenings for around twenty-five years.

It works in series rather than one-offs, and the list is long: Das Wochenende der O and Der Abend der O, Schloss Babylon and the Schlossnacht der Masken, CMNF and CFNM nights, a Römische Orgie, Die goldenen Zwanziger, Die erotische Casinonacht, Secret Blind Dinner, an Eyes-Wide-Shut format, St.Pauli Night, and a party on a chartered train it calls Ein unverschämter Zug.

Alongside the parties it runs bondage, femdom and BDSM workshops with coaching, and erotic travel — culinary weeks at a Tuscan villa, a boutique hotel near Bordeaux, a castle near the Baltic and further afield.

The events tour other people's premises across Germany, Austria, Switzerland and Italy, and each series is bookable for a stated audience — couples, single women, single men or all of them.

Its own description of the work is disarmingly plain: it builds the setting, supplies the story and makes the alibi, so that guests can do what they always wanted to. The one thing it cannot do for you, it says, is the first step of signing up.