Separated Vaginal <-> Anal logic

[ErinaSugino]

Currently, the state of "anal" sex is solely determined by a position defining two actors as having "direct" interaction, while the penetrated actor does or does not posess a vagina. This is represented by the choice of sextalk dialog, the visual representation in POV, as well as the check for impregnation occuring or not.

The idea is to make this it's own mechanic, choosable by the player in the UI, controlling (in situation where both vaginal and anal are applicable) which of the two interactionTypes occur.

For how thoroughly NPCs will utilize this mechanic is yet to be decided.