Can castration change a heterosexual man into a homosexual man or give a heterosexual man homosexual tendencies then changing him into a bisexual man?

castration removes testosterone and sex drive.

Unless a person replaces that hormone by artificial means, they won't have a sex drive.

I am speaking on exactly this topic at the Advancing Excellence in Gender, Sex and Health Research conference sponsored by the Canadian National Institutes of Health Research in Montreal at the end of this month. My talk will be titled ” Voluntary Castration and its Impact on Human Sexuality.”

The answer to your question(s) is “yes and no.” Or, in the order in which they were asked, “no and yes.” A large-scale survey of the eunuch community found that, while some aspects of sexual preferences had changed, NO ONE flipped from exclusively heterosexual to exclusively homosexual, or vice versa. What we found was greater flexibility in preferred gender, much like what has been described for normal eugonadal women. Many studies have shown that they are more interested in a “nice person” than in what is between his or her legs. Kindness, compassion, sense of humor, intelligence, etc. are more important factors in attraction. Exactly what we found with the voluntary eunuchs who were not on hormone replacement therapy. Greatly lowered libido, but wider range of interests….

The greater implication is for the hundreds of thousands of advanced prostate cancer patients who are castrated as part of their treatment. We estimate that there are between half and three-quarters of a million PCa eunuchs in North America today. Any male in the developed world who lives long enough has about a 4% chance of being castrated to treat PCa.

We also found some interesting shifts in basic personality structure in the absence of testosterone – NOT in the direction of female, but in ways that indicate why eunuchs were preferred government administrators, religious personnel and military leaders in the empires stretching across Eurasia over the past four millennia. (They were far more than the guardians of someone else’s women!) This is a topic for a different thread that I will start once I get reactions from the audience in Montreal.