You are right--that was the first detection. But to relate that to a causal vector is entirely unscientific.

"AIDS was first reported June 5, 1981, when the U.S. Centers for Disease Control (CDC) recorded a cluster of Pneumocystis carinii pneumonia (now still classified as PCP but known to be caused by Pneumocystis jirovecii) in five homosexual men in Los Angeles.[132] In the beginning, the CDC did not have an official name for the disease, often referring to it by way of the diseases that were associated with it, for example, lymphadenopathy, the disease after which the discoverers of HIV originally named the virus.[68][69] They also used Kaposi's Sarcoma and Opportunistic Infections, the name by which a task force had been set up in 1981.[133] In the general press, the term GRID, which stood for Gay-related immune deficiency, had been coined.[134] The CDC, in search of a name, and looking at the infected communities coined "the 4H disease," as it seemed to single out Haitians, homosexuals, hemophiliacs, and heroin users.[135] However, after determining that AIDS was not isolated to the homosexual community,[133] the term GRID became misleading and AIDS was introduced at a meeting in July 1982.[136] By September 1982 the CDC started using the name AIDS, and properly defined the illness.[137]"

Source here

The risk vector is unprotected sex; it is increased by unprotected sex amongst already-infected populations. It is increased more by unprotected anal sex.

It is NOT increased by the gender of the sexual partner being the same or the opposite.

The partner's gender makes no difference in the transmission vector. Calling it a homosexual disease is therefore either rampant superstitious ignorance, or rednecked prejudicial bias.



A