I've never been a shaver/waxer, but mostly because I'm lazy and have very fair body hair. Since being pregnant I've probably lost about 75% of my body hair, my legs are nearly as smooth as a baby's bum and it is so fine now it's almost invisible. My head hair, eyebrows/lashes, pubes and underarm hair are all pretty much the same thickness and consistency as before, but grow slower (actually, my underarm hair stopped growing years ago, it does that if you don't ever cut it).

Mine's a boy, so I'm not sure what that does to the theory!