For the Forsaken part it's probably because she is already either stroking or licking your cock so you have to order her to stop by using "stop action"CSdev
Found a minor typo in a Commander entry (double comma at the end), the set-up is Parasitism + both Hate options.
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I've also had some weirdness going on when you Meet a girl, for some reason vaginal sex is often unavailable, and I'm not sure why. It seems to be permanently gone once it does go too, but I haven't really done much testing. Maybe something from gender-swapping, or Negotiation? At one point it (vaginal) could be enabled by tying the girl up (which feels intentional, but I don't know about the criteria), but then that stopped working too, so I'm not really sure what's up or if they're even related.
PS. It persists into becoming a Forsaken, too.
For the Chosen part it's possible you need her to have lvl2 hate and tier2 morality already broken but don't quote me on that, I've only ever use the Meet a Chosen functionality for Negotiation routes.