After the sexual free-for-all that was 1970s glam rock, the pendulum swung back. The 1980s alt-rock landscape was impossibly straight. That’s ironic, since its holy trinity -- R.E.M., Hüsker Dü, and The Smiths -- was made of bands whose frontmen are now respectively queer, out, and sexually nebulous. But in the darker corners of the underground, bands were sprouting up that were defiantly -- and loudly -- gay.