Orgasm training can include denial as part of it... as Dom you control when and how they are allowed to orgasm. As stated above, with men this can lead to increased desire (though sometimes for me it has the opposite effect, it depends on circumstances - sometimes merely making it an official 'CR' period increases the desire when normally it would decrease) and women it can reduce it. However, if you include regular teasing for women but deny orgasm then that desire is still there because you are made to be on edge a lot more. So, in the example above where the sub was expected to orgasm once a day, what if you told the sub that they had to masturbate once a day (and set a time and place where this had to be done and a manner in which it had to be achieved - fingers, wrong handed, toys, length of time etc) and then set the limitation that they were not allowed to cum until permission had been granted? This could be permission given in advance (perhaps as reward for a task well performed) or it could be they have to ask permission while still masturbating so they don't know if they will be permitted until they ask. Is that not likely to keep a woman's desires high?