Some are serious and full of biology lessons for the men who can only deal in facts. Why they turn that colour, why those smells like that, and why you will never ever get to do that again.
Some are aimed at the metrosexual, or the new age man, full of ways to support and encourage the earth-mother to be, bursting with suggestions for sounds of the rainforest soundtracks, and reasons why you should be delighted if she decides to give birth alongside badgers in a ditch.
Some are oh-so-funny for the knuckle draggers who aren't quite sure how they ended up in this predicament. Full of jokes and anecdotes about clumsy, dopey, yet ultimately endearing fathers-to-be. Brimming with all the appropriate lies to tell the shed sized woman yelling and waddling around your house.
All of these variations have some worth. All are accurate in their own way. All reflect the truth under the right light.
Whatever angle they take, they always revert to the image of the curled-up-on-the-sofa couple, or the oversized scarf wearing, hand-holding in the park couple, where everything is just about a palatable shade of bliss.
None of them tell you the one thing that every man should know. None dare to pull the rug from under the feet of the poor expectant father and land him on his arse on the hardwood floor of reality.
You can not, and will not, EVER win an argument while your partner is pregnant. In fact, my guess is most poor bastards won't for the 6 or 12 months that follow.
Forget it. Totally, utterly, and completely forget it.
She will never have to do anything if she doesn't feel like it, meanwhile you can never refuse to do anything you don't feel like doing.
'Well I am busy growing a human', 'but the baby wants it', and the more accusatory 'I'm carrying your child you know' are all just variations on that theme which will see you running around like a blue arsed fly for the foreseeable future.
Whichever flavour of father-to-be you are, everything boils down to - you're screwed, dude.
You're welcome.