They swell because they've got milk in.
Little boobs swell too.
( LimeyTreat Bitch. Lover. Child. Mother. Sinner. Saint., Sat 23 May 2009, 19:11, archived)

Like I mentioned above
it may be the idea of already being swollen that attracts males. I could be wrong, but hey, it's a theory.
( SuperMatt, Sat 23 May 2009, 19:13, archived)

So that's why men like big swollen bellies on women
it's clear.
( Flapjack I spay a little mare for you, Sat 23 May 2009, 19:16, archived)

That's not what I said!

( SuperMatt, Sat 23 May 2009, 19:17, archived)

Some men do
It's a fairly well-known fetish to prefer pregnant women, just as it is to prefer lactating women.
( Lord Gnome, Sat 23 May 2009, 19:22, archived)