Sexing rabbits

I have tried a few times to sex the baby rabbits. There are good instructions on the internet, but I could never get the 'bits' to pop out like they are meant to,

I have finally got the hang of it! Or maybe it is just easier now the babies are bigger.

The white one on the very right here is female and the one in the middle that looks like it has a moustache is male. I haven't bothered doing them all as it doesn't really matter as ALL will be eaten regardless of sex.