late to the party on this one but... I've got three and i was there for all of them and i can tell you this. If there is one place on this earth where a man has no place being it is in a birthing room.
firstly. all the women in there, midwifes nurses etc treat you like a spare peg. they've got a job to do, you're just the sperm donor.
secondly you are basically a decoration and a safeguard there to hold a hand and stay the F out of the way.
thirdly, at some point your dear partner will probably turn on you, it's not personal, just the pain. Speaking of which...
fourthly, you will have to see the person you love suffer in pain and anguish, probably for a very long time, which is awful, probably the most harrowing thing about the whole business.
fifthly. There will be blood - lots of it, from the moment the plug goes you can expect viscous lumpy gooey black lumps and even worse a doctor may have to intentionally take a scalpel to your ladies bits to ease the birth - quite shocking i assure you.
sixth the distended look of the aforementioned lady bits will probably put you off doing the naughty for a significant amount of time.
seven. once the birth is done the lady gets a massive dose of happiness endorphins and exhaustion you are just left there feeling shocked, harrowed, useless, helpless and not knowing what to do with the really powerful emotional experiences you've just been through.
it would be better if men were somehow expecting this experience, but the whole birthing class crap does absolutely nothing to allay the impact or adequately prepare you.
i went in there cos my partner wanted it. in that respect it was the right thing to do, but... please reread.