The Bizarre Ones (1968)

The title tells the story

While on a leisurely ride in the country, a kinky dominatrix picks up a young male hitchhiker. At the first opportunity she handcuffs and blindfolds him, then takes him to a farmhouse where she ties up the young man and brings out three of her fellow dominatrixes, who take turns abusing and humiliating their captive--and each other.