in Chemistry.... opposites attract!
and like dissolves like...
Tell that to gay people.
Like dissolves like? And, you know, some gasses are happy being diatomic, if y'know what I mean.
I am known for using chemistry as metaphors for human behavior, including love. but, in the end, chemistry is predictable (within reason) and love is not.
I consider myself a scientist, and as such, I've never been comfortable with things that can't be proven experimentally. That's what makes it all teh more meaningful when I can find it in me to say "I love you," and the ones closest to me know that.