I'm very confused by the "Use[bodypart]" and "Target [bodypart]" mechanic. The description of the mechanic seems to contradict itself. Will "target pussy" make me week to actions involving that part, or will I do more damage when targeting my partners pussy?
Depends on the context. If you have a large "target pussy" preference (in sex actions), you receive from lust damage with actions where you're targetting a pussy, such as scissoring, being scissored, performing vaginal penetration and licking pussy. On the other hand, the combat affinities (one of which is "target pussy") have strength, frailty, resistance and weakness, and all of these stats are independent.