BBC: Germany urges paedophiles out of the shadows
Max is a science graduate, in his early thirties. Articulate, with a ready smile and an infectious laugh. He could be your neighbour, your work colleague or your sister's new boyfriend. A nice guy. An average bloke. Except he's also a paedophile.
Max is sexually attracted to pre-pubescent girls — typically between the ages of six and 11. It's an urge that for years filled him with self-loathing and despair.
"I would see a girl, and I would undress the girl in my mind, and it was just disgusting, and I'd say to myself: 'Stop this.' And it just wouldn't stop. I had feelings of disgust and fear," he says.
Max has never abused a child sexually, nor does he consume child pornography — itself a form of indirect abuse, because children are usually involved in its production. In fact Max is just one of many people who feel an attraction to children, but who are determined not to act on it.
They are sometimes called celibate or "virtuous" paedophiles. The word "paedophilia" describes the sexual attraction, not the abuse itself, so not all paedophiles are child abusers - and not all child abusers are paedophiles, experts say, since abuse sometimes has other root causes.