"The cervix is a dark, treacherous maze of uncharted tunnels"

I'm watching the sperm program on BBC Two. I wouldn't have bothered mentioning it but in one of the scene setting shots it shows the billions of sperm waiting for action in the bloke's testicle tubes (I'm not a biologist - I don't know what these are technically called). Each sperm is represented by a person dressed in white.

I'm not kidding - as the cam…