Also, we can't forget the Snape/Karkaroff - all that lovely tension, and the way arguing wtih him makes Snape want to hex the petting couples out of the rosebushes. And you know, the first time I read GoF, I was certain there was a nod to Bill Weasley being gay: Long hair, earring, urged by his mother to settle down, and the only male who doesn't seem affected by Fleur's charms. Then OotP came out and shattered my illusions.