Any media where they discuss castration

[Lizz]

I disagree that most women are repulsed by eunuchs.
Most women I know don't know anything about eunuchs!
And most women have had a lot of trouble with men.
If women knew that a eunuch is likely to be more faithful, less angry, and more even-tempered than a man, eunuchs could become very popular as partners.
Modern eunuchs need a public relations campaign

"Maybe 40+ or even 50+ would like a eunuch man, but, from my experience in three different states in Brazil, women until their 40s value sex a lot. Most women might not care about missing testicles, as long at it doesn't interfere in the sex live, but definitely wouldn't like a nullo."

I hear you, many younger women value sex. But their testosterone/sex drive is still a fraction of mens'. That is true, that many older women would value eunuchs after menopause. Additionally, women of ALL ages who have been cheated on or physically beaten up by men would be interested in peaceful partners.
Plus there are the asexuals...on the asexual dating site ace-book.net, there are more women of all ages there than men. Many of these like affection but don't need the big sex drives of men.