When I tried this, the images failed to arouse me and just got annoying. If you successfully created a fetish for anki reviews (or mathematical symbols, or reading carefully-reasoned arguments, or destroying ugh fields...), I don't actually think that would interfere much with the task, especially if you were able to abstain from sex/masturbation for a long time (perhaps through some sort of precommitment mechanism, such as a chastity belt with the key either given to someone else with instructions not to give it back for some time, or stored three hours' drive from wherever you live).