All of the characters through out 1-3 were really straight haha. If anyone was going to eventually be in a relationship with a person of the same sex, I would have definitely said Faith, or even Buffy. But if he was going to go with either Willow or Xander, I believe they would have both worked out much the same way. Personally, I don't care which one it is. However, I do think either way whoever it was should have been bi. I never really believe Willow is all of a sudden disgusted at the thought of penis when she clearly was in love with Oz and enjoyed having sex with him, but whatever. Either way it was helpful to queer girls, but from a writing aspect, it wasn't the most logical way to go. Even Vamp Willow is bisexual, not gay.