Wontpower 

Antonym of willpower. A synonym is weakness. A powerful lack of willpower.

I have a very strong sense of wontpower and can refuse to not do most things.

Wontpower by ryatellsastory March 31, 2015

wantpower 

the ability to make gratifying and often beneficial decisions based on one's impulses or wants without an overbearing sense of self-control;

that which enables people to do what feels good or what they like to do.

Although another glass of wine may not have been the wisest decision, the woman's wantpower enabled her to thoroughly enjoy the extra glass of vino free from guilt or shame.

wantpower by tronlaw July 24, 2011