Apparently, there is no marking of territory involved, they don't even go round chinning things, what they do is hold paws a lot, stick their tongues in each other's mouths, and when they are satisfied that a long enough time has passed, they dress up in really strange clothes, go into a really big burrow, kneel down, and sing some songs (but not bunny tunes, so what's the point).
Our 2-foots bonded 29 years ago, but were not adopted by buns until 6 years ago. There is no excuse for this, so we are sending them out to the pub this lunchtime for punishment.