I'm pretty sure feminism killed the thin lesbian scene.  It engulfed the GLBT community and started championing gay rights, but decided to also toss in a bunch of other ideology. Which included fat acceptance. So now believing in women's rights or gay rights is tied to hating the 'patriarchy', getting fat and political lesbianism. And if you don't agree 100% with it all you get outcast. Yet if you go to Japan or Korea you can find a bunch of hot bi and les girls if you know where to look. At least for now.