There is no general sensitivity.
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As you see on the attached, that stat is broken down into separate body regions corresponding to sex techniques involving those regions. It's clear to see that my Karryn is a butt-slut (213%) that has almost completely neglected her pussy (15% sensitivity).
At the start of the game, you may choose which body part is extra sensitive and then, basically, the more a given body part is used, the more sensitive it becomes through achieving number of passives. Also, as she becomes more fatigued throughout the day, she will become more sensitive. That Karryn's anal sensitivity reaches mid 300 towards the end of day, after dozens of goblins fucked her butt at the reception, at least 3 patrons cornholed her in the bar and most of rebelling inmates have been subdued with her asspussy. So if you want to take her for a hellish ride through gangbang multiorgasmic hell, make sure she's almost exhausted.