This assertion needs a source. He is obviously referring to male homosexuals, not lesbians. Their lives may be shortened by obesity, but not by HIV.
Long story, that! On these threads are Doctors reports, about what Lesbians are suseptable to. A multitude of things. While not necessarily AIDS, a whole host of cancers.
Homosexual is appropriate for either gender.
Homo from Latin means: A member of the genus Homo, which includes the extinct and extant species of humans.
Homo from Greek means: Same
In general usage it usually refers to males though.
Lesbians contract HIV at about the same rate as the general population, or so I have read.