A female character appears to swim nude in a pond.
In the dream ballet sequence, Laurey accidentally enters a brothel. There is no visual sex or nudity.
There is discussion of a small kaleidoscope called "The Little Wonder". When a person looks through it, it is implied they see suggestive pictures (which are never actually shown onscreen).
A character tries to force another to kiss them.
One character has a fondness for pornographic postcards (which are never shown onscreen) although there is reference to a naked woman at one point.
One character is implied to be promiscuous.
Two characters are implied to have had sex offscreen after their wedding.