Encounter-only traits would be only for the girls, yes. More like my little secret to make them more interesting, I promise they will always be static and I won't change them to make your lives hard. That way you'll be able to maybe form a strategy (these sorts of actions work, but not others), but you won't be able to pinpoint the exact trait without some experimentation.
V-resist is the only one with 2 weaknesses, since it is also the one that will probably be activated more. Unless you are particularly forceful, erm, not many girls will let you invade their other parts right away.
There is no touch resist at the moment, since I was a little wary of what could be classified under touch. Also, for balancing, then I'd have to add in like, breast resistance, and (insert body part) resistance, so I kept it this way for now.