My personal favorite scene from Palmer's "Daughter For Dessert". Kathy (the black-haired adventurous nerdy girl of the game) seduces her diner employer, Richard, and her slightly (but only slightly) more conservative busty redhead coworker Heidi... into a threesome at her apartment. Of course, both Richard and Heidi see through her game very clearly from the very beginning, but apparently some deep pull inside both of them gives them no choice but to play along as happy, consenting participants...