Evidently, there are people wandering the streets of Austin who want to engage in homosexual acts. Only they don't know what that means. So they come across this gay bookstore, see, and peek in the window -- to find out about these mysterious urges they have.
... the view from the street is also consoling. It makes life as a homosexual look safe and unthreatening. Normal, in other words. Sooner or later, many of these people will stop looking in through the window and go inside.
Unfortunately, the window lies (y'know, beause gays are deceitful). It has biographies of Oscar Wilde and Walt Whitman, and makes people think "homosexual acts" means reading about poets. But no:
Eventually, they will find their way back to the porn, with the rest of the customers.
It seems the people who are tempted by homosexual acts then hold their noses and say "I don't really want to do this, but that's what 'homosexual acts' means, and I'm interested in homosexual acts, so I guess I have no choice."
And, gentle reader, that is where most of them will spend the rest of their lives, until God or AIDS, drugs or alcohol, suicide or a lonely old age, intervenes.
Homosexuals never interact with other homosexuals, much less have sex with them. No, if you want to know homosexuality, picture a manicured hand flipping through a rack of porn forever. It sounds terribly dull to me -- not even watching the videos -- but I'm not gay, so what do I know?