Well,  since it seems like Sexual instinct would have a bonus (to charisma or grace perhaps) you would have to wait until level 2.  Seriously though,  if you plan on simply altering your humilations into positives please talk to me first and get the okay.  I will be fair,  but in truth some humilations just wouldn't effect a character enough that they would provide tangible bonuses unless they were grotesquely modified.