Castration changed my whole life for the better, I had a very bad temper , went to anger management twice ( court ordered ) . was arrested for running a car off the road, lost jobs , fought with my neighbors. their kids , store clerks < I was just a very miserable mean person, My wife is from Sweden , we went to visit her mom for Christmas in Sweden she lived outside of town on a farm . I saw some children playing with a hay wagon that was being pulled by an ox, My mother in law said that the ox used to be the meanest bull on the farm but she had it castrated and its almost a family pet now. A light bulb went off in my wifes head about having me
castrated we Talked about it, I'm 48 and she is 45 we will never have children anyway she said it might help me with my anger and personality problems , I really don't need them anyway , they just hang down there doing nothing The next day we asked her mothers advice she thought it would be a good Idea . she made arrangements to see a doctor in Stockholm, The doctor agreed to the surgery but we would have to wait 90 days in case we changed our minds, We went back to Sweden in may , That was 4 years ago. the morning befor my surgery I took the seditives,and antibotics tablets, My mother in law drove us to the clinic I was half asleep from the meds .when we were in the car but I remember my wife holding my balls and sobbing slightly, at the clinic I put on a gown and layed on my back on the exam table myfeet were placed in sturups and my knees were drawn up close. my wife was on one side and my mother in lay on the other. they each held one of my hands, The nurse gave me an I V injection that put me out. When I started to wake up I was in a recovery room half asleep,I felt down to my crotch and nothing was there except a bandage, I was now a wife and her mother came in after a while I think that was the happiest I have ever seen my wife , she took turns hugging me with her mom. The result was better than I could have ever expected . I really love life now . I just want to be with my wife as much as I can ,Sex is different now , I can take it or leave it but if it makes my wife happy I want to do it for her . I can still get an erection but it takes time to get hard .so I like to do oral to her and just play with her. Another plus is when I do ejaculate there is almost no cum so no cleanup,
One study using MCF-7 breast cancer cells (a cell line responsive to estrogen) noted that Maca at -100ug/mL was able to induce proliferation and induced notable estrogenicity at 100-200ug/mL concentration, but was less potent than physiological concentrations of estrogen;  the potency was comparable to that of Silymarin from Milk Thistle .  Estrogenic effects have been seen in vivo when ovariectomized rats were given /kg ethanolic extract of Maca (equivalent to /kg root extract), where the measured uterine weight after 28 weeks was % of ovariectomized control but % that of non-menopausal control.  Another study using a lower dose of three variants of Maca for 4 weeks failed to establish estrogenic effects,  and estrogenic effects have also failed to be observed in other in vitro assays. 
The second theory is similar and is known as "evolutionary neuroandrogenic (ENA) theory of male aggression".   Testosterone and other androgens have evolved to masculinize a brain in order to be competitive even to the point of risking harm to the person and others. By doing so, individuals with masculinized brains as a result of pre-natal and adult life testosterone and androgens enhance their resource acquiring abilities in order to survive, attract and copulate with mates as much as possible.  The masculinization of the brain is not just mediated by testosterone levels at the adult stage, but also testosterone exposure in the womb as a fetus. Higher pre-natal testosterone indicated by a low digit ratio as well as adult testosterone levels increased risk of fouls or aggression among male players in a soccer game.  Studies have also found higher pre-natal testosterone or lower digit ratio to be correlated with higher aggression in males.