I prefer the silly, tounge-in-cheek interpretation of this thread.
Manhood is awesome

We don't have to wear annoying tight and delicate clothes, heels, or smear weird coloured stuff on our faces when we go out.
(Also, we get all the best clothes... POCKETS FTW!)
It's not weird if we like spending time alone with machines.
We can still build models, play computer games, race go-karts, stay up all night coding, have lan parties, etc well into adulthood - and it's socially acceptable (ok, a little weird.... but still much more acceptable than it is for women).
We don't have to pretend to be interested in someone elses snot nosed brats. Someone shows us their ugly baby on their cameraphone, and it's ok for us to say "Nice Phone!" - and not sound like we're covering for something.
We don't have to be all "touchy-feely" - men get to keep their personal space to themselves in social groups.
We can surround ourselves with cool, latest gen gadgets while still wearing the same free trade show tshirts from ten years ago - and it's normal.
It's acceptable for us to not have a family, or even want a family. We can live the single life, and not get hasseled too badly for it. Fewer people annoy us about getting married and having kids, etc.
We get listened to on technical matters (though I'm still very aware first hand of what you ladies go through...).
We can eat the damn cookie

(Diet? Isn't that something women do?). It's ok to have an extra 10kg on - you get a little more social wiggle room if you're a man.