There are public lewding worlds where you can meet people who just want to fuck, but since anyone can join these and wait for someone else, it's a last resort for anyone who already has any lewding partners.
For 1 on 1:
https://www.vrchat.com/home/launch?worldId=wrld_e0e29017-9061-432f-b3d7-b2005dc323fc
For groups:
https://www.vrchat.com/home/launch?worldId=wrld_e5c30b56-efa8-42d5-a8d4-a2cca2bf3403