if you search in the game scripts, sensitivity is mentioned only when calculating arousal during all scenes and actions. for example in
Data\Batch\Action_CHSH_Masturbation.rb.
and arousal only to determine when the heroine should reach the limit of her body (and it improves with the improvement of will). and also if it exceeds the maximum, but does not reset, then the hero begins to lose stats
Data\Scripts\Editables\100_Game_Player_handle_on_move.rb