Lot of "corruption" game have the same feature : you have some "lewd" status that increase by grinding and allow you to do more lewd things. Doing such nasty things increase slowly those stats. It's the main core mechanism.
Some include intoxication (alcool, drugs) or hypnotic states that allow a "bonus" in your lewd stats level.
But none really include social or economical pressure.
Social pressure : if someone or a group who have influence on you (love, fear, respect...), they can successfuly demand you to do lewd thing you will never do for other people.
Economical pressure : you're too short on money to pay something important (loan, debt, landlord, foods, drugs...). More the date of your due payement is close, more you are ready to do stuff you will normally not do to gain money. In case of needs like food/water, drugs or any other "vital" resources, more you're laking them, more you're ready to do "bad" things.
After all people doesn't change by themself, it's external pressure conflicting with their own need which change them, forcing them to adapt (or corrupting them in such game).