is there a way to mod the game to decrease how much desire you need to do sex acts?
my guess is that the values can be changed in the plugin files.
You can modify the desire requirements for sex acts by modifying this file;
Karryn's Prison\www\js\plugins\RemtairyKarrynPassives.js
Just search for "Desire Requirements" and you should land above kissingMouthDesireRequirement.
Change the number in "let req = 75;" to whatever number you want.
Though I recommend you put in the old value after two blackslashes at the end of the line(this works as a reminder), just incase.
Code:
Game_Actor.prototype.kissingMouthDesireRequirement = function(kissingLvl, karrynSkillUse) {
let req = 10;//75
Or just backup the file before you mess with it, whatever you prefer.
Backup your save too. I have no idea what could happen if the values go negative. I've only ever used this to raise the value.