1. it makes sense.
irkens don't have sex organs, so it doesn't matter who they love, human males or females. its not like they can have babies. :P
2. its pretty much canon.
they hate each other so much, its possible they love each other. i mean, come on. theys so cute!
3. they watch each other obsessively.
i mean, really. in the Frycook That Came From All That Way Space dib knows exactly how long Zim is gone. and in the Halloween episode, Zim notices that Dib disappears. Dib monitors Zim, stalks him, and Zim, don't get me started. he also monitors him, and they work together in some episodes.
4.its so damn cute!
read fluffy fanfictions