Perusing the Huggies forum yesterday, I came across something called horny goat weed.
And it is what it sounds like - an aphrodisiac. There's hope for the boy yet.
Apparently the Chinese have been using it for thousands of years, for mojo-related purposes. And look how many Chinese there are in the world.
I'm a little surprised that the boy hasn't been slipping it into my cuppa every evening (or, if he has, it mustn't be working). Perhaps he just doesn't want to risk getting blood and guts all over the duvet (side effects include dizziness, vomiting, dry mouth, thirst and nosebleed).