Well, parrots that were raised on soy (first handfeeding formula and then pellets) do mature earlier than they are supposed to but, as far as my personal experience goes, only parrots that are overly hormonal masturbate on their owners. I only had one parrot that did that. It was my first rescue and the poor thing was kept at a human light schedule, free-fed seeds and touched improperly all the time but once I learned and improved my husbandry, I haven't had a single one doing it (and she stopped, too). As to sprouts... well, if you think about it, they only appear in nature during the growing season (which usually coincides down to the minute to the birds breeding season) so I only feed them when the breeding season is already on. I am going to start adding them (also twice a week) next week (I am going to ABBA this Saturday and will stock up on hemp seed, sprouting mix, freeze-dried mealworms and baby food for the canaries).