Is vowing to fast one day for each time one masturbates valid, and how can it be annulled?

Unlawfully discharging one's desires, including through masturbation, is an transgression against Allah's command and the limits of His law, as stated in the Almighty's words: (And those who guard their private parts Except from their wives or those their right hands possess, for indeed, they are not to be blamed – But whoever seeks beyond that, then those are the transgressors). As for a vow of obstinacy and anger, its maker is given the choice between fulfilling what he committed to (fasting) or performing an expiation for breaking an oath.