What was your aha moment, Anne, when you were teaching people about sexual education that made you realise that we, as humans, had gotten this wrong? How did you work it out?

I think it's, as ever with these aha moments, they build on other experiences you've had, right? So I think probably a lot of us, our lived experience, where my sex education at my all-girls school consisted entirely of our biology teacher, Mr Graham, bless him, who was given the task and looked terrified, first of all, and then came into the biology lab and said, I found a fail safe way to prevent you getting pregnant.

There was quite a lot of unintended pregnancy at my school.

And then he said, it's you just using an aspirin.

And we were like, really excited.

Wow, this is going to be easy.

And then he said, just take the aspirin, put it between your knees and hold it there.

So talk to us about those, Anne.