The kinder gentler form of black mail that wimmin use on their significant others. Can also be referred to as guilt leverage.
Wife: Sweetie, I'm not going to shave my armpits until you shave your beard.
Husband: You're not going to white mail me that easily. Beard stays.
Wife: Fine, I'll just be a hairy monkey.
Husband: Sorry, dear, I'll get rid of the beard.