I havent noticed a way to modify pleasure gains in any way (unless you mean editing game files). However in orc stage if you escape but don't break the cuffs you immediately go to the next level, so you don't need to fill the gauge.
Edit: Actually there is. If your MP is empty you gain large amounts of pleasure.
Your controlled protagonist girl gets sexually interacted with during combat and in gameover-battles!
The blond girl has a couple of long scenes with a guy. I think she is always in charge of the scenes.