The "Birds and the Bees talk" is a conversation many parents dread having with their kids.
One way around this is to buy them a book which helps to explain how babies are made in an age-appropriate way.
If you decide to go down this route, there's a chance you'll come across a book called The Amazing True Story of How Babies Are Made.
Be warned: it contains some seriously graphic images - and it's divided parents with some branding it as “inappropriate.”
The picture book, by Sydney-based cartoonist and illustrator Fiona Katauskas, describes sexual intercourse as a “jigsaw puzzle” where both parties get a "tingly, excited, very loving feeling."
It’s prompted fierce debate among parents on Facebook.
“Seriously this is inappropriate to be in a kids section,” opined one Facebook user.
Another added: “Omg really? There is time for all this c**p, just let kids be kids they don't need to know the finer details.”
No offence taken
Not all parents were offended by the book, however, and some have defended it.
“Parents buy books like this for kids as a way of teaching them, if you don't want to buy it, don't buy it,” one Facebook user said.
Another commented, “Nothing wrong with it. I'm going there tomorrow to buy one for my son. Better he learns the truth in a tasteful book than in the schoolyard.”
On her website, Katauskas writes that she created the book when her eldest son asked where babies come from.
Frustrated at not being able to find a good sex education book, she decided to write her own.
Katauskas explains that she wanted the book to be “straightforward and honest” and to include a range of different types of families and parents.
She also wanted it to include a “hefty dose of humour” to help alleviate any embarrassment parents may be feeling.
The Amazing True Story of How Babies Are Made is available on the shelves of Kmart in Australia for $12 - and while it's not on sale in the UK yet, it can be purchased via eBay.