Those who do are usually reacting to negative societal attitudes toward homosexuality. If a friend tells you he or she is gay, then that friend is coming on to you. If a gay person chooses to come out to you, then that person has decided to share part of his or her identity with you. Such a disclosure means only that this friend trusts you, not that he or she would like to become sexually involved with you. If you have friends who are gay or lesbian, that must mean you are also gay.
Viruses infect all kinds of people, regardless of their sexual orientation.
AIDS is spread through the exchange of bodily fluids, such as blood, semen and breast milk. Some people have contracted AIDS from sharing intravenous needles. While AIDS has been contracted by a large number of gay men, it has also been contracted by heterosexual men and women as well as and children and even infants.