YM-Partys is a producer of lifestyle and swinger parties in Koblenz, trading under the name Youngmarriage and aimed at younger couples. It holds no premises of its own and runs its nights in clubs around the city.

It works as a series of themed nights rather than one recurring party. Those announced when this page was written were Boobs & Pools, a topless neon night, a young couples' night, an event billed as XXX and a Dirty Sunday. Tickets and details for each go through listings on an external platform, and the site itself carries a gallery, a dates page, directions, an FAQ and a newsletter.

Admission is restricted to adults: the site opens with an age gate requiring visitors to confirm they are at least eighteen, and it names a youth-protection officer as German law requires. Contact is by email.