> There are two forces at play: decreasing infection rates among gay men, and increasing infection rates among straight men. Both aspects of the curve are "doin

> There are two forces at play: decreasing infection rates among gay men, and increasing infection rates among straight men. Both aspects of the curve are "doing work" to change the statistics. You may have missed the point — only one of those is modulated by (relative) delay in heterosexual diagnoses post-infection.