It's true, and the scene includes Richard as well (who has been replaced by a pod person, because there's no other way you can explain his personality transplant - no LKH, not even with therapy). And of course the whole thing can only be done "bondage" style.

And Micah and Nathaniel haven't had "intercourse", per Anita's definition, but we are given a bluntly TMI statement by Micah that he knows firsthand that Nathaniel has no gag reflex. And Anita knows this because she watches them.