Perhaps your mother was too young at that point to be completely sure of her sexual orientation (as if anyone really is). Anyway, she did get something good out of the marriage- you!

I never gave a single thought to the characters' sexuality until I started reading and writing fanfic, LOL. HP used to be just another addictive guilty pleasure. And now I see the characters (or at least Harry and Draco) on a whole 'nother level.