Today many more straight people than gays have HIV/AIDS.
In the early days of AIDS, the disease spread faster among gay people, which is why it became known as a gay disease, but today that is no longer the case.
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The anus/rectum is very susceptible to cuts and tears while conducting anal sex. This means there is a greater chance for infected body fluids to enter the blood stream. Sexuality has no direct influence in the prevalence of HIV/AIDS, it is the practices concerned with the sexuality.
The main factors in why HIV transmission is higher in the MSM category are the following:
Simply because the disease was first noted among gay communities, leading people who dislike homosexuals to refer to it as "the gay plague," in some cases because they believed it to be a punishment inflicted on those whose lifestyles they believe to be in some way wrong or ungodly. Medicine became aware very early on that AIDS could be spread just as easily amongst heterosexuals, but to this day large numbers of ill-informed people believe it to be confined to homosexuals.
Anyone can contract the HIV virus, not just gay men. However, unprotected anal sex is the type of sex where the virus is most easily spread whether it be between 2 men or man and woman.
In the 1980's HIV spread faster among the gay population because of cultural differences in dating. Today, the majority of people with HIV are heterosexual.