Browsing this sex code stuff is making my eyes cross. I would like to include a desire to get bred, and have it met if the character gets ejaculated into. I figured out the desire part, and how to add conditions (Submissive or Monogamous or Clingy, past a certain loyalty threshold, etc.), and how to make a category for breedable acts (one for MPreg, one for normal), so I can ask "was the last action a breedable action?" and probably also "was this character the receiving partner?"
But I can't see how to ask "did it involve ejaculation by the penetrator?"