Yes, in fact in countries where homosexuality is illegal, gay people must marry the opposite sex and often have children.
Gay men tend to have more in common with girls than straight males do. Whether they are pretty or not.
gay men arnt interested in dating girls
Girls can tell or know if a guy is gay by observing his behavior in a group of men.
Because secretly gay men are gay in secret, it's not possible to count them.
Friends
If by "men" you mean straight men then yes it is entirely possible for a staight man to love a gay man or even another straight man without being gay himself. This does not mean however that the straight man suddenly becomes a gay man and neither does it indicate that the man is bisexual. It simply means that he is attracted to a certain male but is still strictly attracted to girls.
Depends entirely on the girl.
no, but it's possible that closeted gay men who pretend to be straight might do this.
He's your brother. What does it matter? Accept him as he is, regardless of who he kisses.
Nobody can "opt" to be gay. It is not possible to change sexual orientation.
Men are men, and women are women, irregardless of skin color.
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.