Hef Was Abusive
According to many former Playmates, Hef encouraged "competition" between the Playmates that lived with him. Hef had been accused of playing mind games with everyone who stayed at the mansion, and he reportedly manipulated a ton of people into doing things they otherwise wouldn't have done. Although he seems cool and collected on the outside, he was pretty rotten on the inside...
The Dating Triangle
Hef would constantly pit his "main girlfriend" against the newest members of the Playboy Mansion. He always said that a little friendly competition never hurt anyone, but his actions were extremely manipulative and objectifying. Bunnies constantly fought each other for the attention of Hugh, but in the end, he wasn't worth their time.