The corruption levels reset to their baselines after each fight (It's intended). To increase baseline corruption you must unlock "progress passives" in your sensitivity matrix by getting some lewd activities in fight.
In order to get tits grope or asscheeks jobs, currently the most efficient way is to stall the combat with an horny enemy ( using "calming thoughs" among over things) to slowly increase corruption level.
Here is a tip : try to keep one enemy alive and get him horny, then try to stall the fight keeping your willpower low, since low willpower passively increase corruption level each turn. Watch out that your willpower never reach 0.