The evil vampire Willow was quite a while ago (don't know which season) but was portrayed even then as being somewhat bisexual.

Anyway, there are a lot of good lines in that show.

From 'The Watchers Guide':

"'I aspire to help my fellow man'. Check. As long as he's not, smelly or dirty or something gross." - Cordelia

"Sorry, I'm an old-fashioned girl. I was raised to believe the men dig up the corpses and the women have the babies." - Buffy

"On behalf of my gender: Hey!" - Xander

"Cavalry's here;cavalry's a frightened guy with a rock, but it's here." - Xander once again.



And some more Willow:

"Even I was bored. And I'm a science nerd." - Talking about a particularly dull biology class.

"I don't get wild. Wild on me equals 'spaz'."

Never really got into the series. (Of course I didn't get into Buffy until the re-runs on F/X started a few months ago.)

'Angel' never seemed as quotable as Buffy.