I don't think it's necessary to have the same interests, like many other people have said, it's the differences that make it interesting but I agree with Nesa... the borderline obsessions (
) we have in life need to be respected and not made fun of.
Luckily, my blokee is a geek in his own little way, he's not into SF&F as such but does love a Graphic Novel which was how he got into Neil Gaiman...
Our tastes in all areas do cross over somewhere but we're also at the extremes, for example, I can't stand heavy metal music, it makes my brain hurt, blokee loves loves loves bands like Mad Capsule Markets, Slayer, Metallica.. the list goes on... blokee hates pop, whereas I've been known to bop around the house to a bit of Britney & co but we meet up in the middle with bands like Lemon Jelly, Foo Fighters, QOTSA, Zero 7, Grand National, Captain, Goldfrapp etc...
It's pretty much the same with books, he loves factual books about the history of all different cultures or things like Peter Ackroyd's
LONDON: A Biography and although these topics interest me, I just can't read the books, I don't absorb factual books very well (I blame pregnancy and school) and I, well, I love my fantasy novels and although he really isn't into that sort of thing, we meet in the middle with authors like Neil Gaiman. China Mieville etc and we both also enjoy biographies and books about various mythologies (which is borderline fantasy if you ask me but nevermind
).
The same thing applies to film also and pretty much every other topic out there, we find ourselves pretty much loving what the other hates but meeting
somewhere in the middle...
As far as forums go, I have Chronicles & a couple of others and he has his footy forums so we're both guilty there but as you can see, rather different tastes and concerns!
xx