Erotic Tales: Wet (1994)

Wet, directed by Bob Rafelson, is the second short film in the Erotic Tales series, produced beginning in the early 1990s.
Davida (Cynda Williams) enters a store just before closing time and wants to buy a bathtub. Only the manager is in the store, and since business is not good, he’s willing to keep it open longer. Davida wants to try out the bathtubs and asks the manager to get into the tub with her, to make sure it will fit two people…
In the tenth minute Cynda Williams undresses and enters the hot tub in black panties and bra, then begins to seduce the store manager. Five minutes later, the actress removes her bra and panties and gets out of the water. We see her walking toward a glass door and can admire her beautiful ass. A minute later we find Cynda Williams naked in the tub, moving to make room for the manager, who enters with her. The two chat for a while, then she stands up giving us a close-up of her dripping ass.