Night City offers several opportunities for V to have purely sexual relationships. There are not full romances like the ones V can have with four characters above.
First off, let’s get something clear: V cannot use erotic Braindances. You can buy some from sex shops, but there’s a line in the description that says it’s incompatible with V. It’ll only show up in your inventory as junk, so you’re better off saving your credits for something else.
However, V can pay sex workers, Joytoys, for their services. The service costs $100 and, when you pay, you’ll get a sex scene that varies based on the Joytoy.
The first two you’ll encounter are at Jig-Jig Street in Westbrook. Their locations are marked on the map with a lips symbol.