I remember a scene with Jerry Butler [whom I couldn't stand] and Barbara Dare [whom never really turned me on]. It was a condom scene and he was giving it to her really hard. The condom apparently broke and and he withdrew and told her about it. She had a glazed [no pun intended] look in her eyes and looked up at him and said "huh"? " it did what"? she was almost incoherent and obviously completely lost in getting fucked. No faking going on there. I found that the most erotic thing in the scene.
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I may not know arse but I know what I like !