Yes, they have the same anatomy as straight men. Yes, they are not infirtile just because they are gay. In fact lots of gay men are fathers. They can inseminate the woman during sex, which would be difficult for most, or have artificial insemination, which is the way most decide.
Nobody can turn gay, but if it were possible, and if all men turned gay, then reproduction would have to be done mainly through artificial insemination.
reproduction
All organisms are capable of growth, reproduction, responding to stimuli, and adapting to their environment in order to survive.
Asexual reproduction
Gay men are already men.
Gay men are individuals who are attracted to other men romantically and/or sexually. Sexual orientation (being gay) does not influence someone's gender identity (being a man). Men, whether straight or gay, identify as male based on their self-perception and expression.
Sea stars are capable of both types of reproduction.
Asexual
No, not exactly. A eunuch was a man who has been castrated and is incapable of reproduction. This however does not indicate that he was a gay or not. He was just an unfortunate individual who was so assigned to the position of guarding a rich person's harem.
When women are gay, they are interested in other women. When men are gay, they are intersted in other men
No, the sun is not capable of cognizant thought, and therefore, cannot be gay.
Yes. Most men (gay or straight) are capable of getting erections from physical stimulation, even if there is no sexual attraction. Achieving climax may be difficult or impossible though.