The Kremlin Letter (1970)

Several characters are (explicitly or implicitly) gay.

Several scenes take place in a brothel and feature discussion of the lives of prostitutes.

A father is forced to watch footage of his 18-year-old daughter making out with another woman and becomes distressed. (The actress is clearly older than her character is meant to be.)

Five women wrestle on the ground for money. Cleavage is shown along with some in bra and panties.

Woman in short nighty enters man's bedroom as he lays in bed. She tells him she is a virgin and he invites her into his bed. Sex is implied. Later on, they room in a situation where the share a bedroom.