Mika wrote this song as a message to his younger sister, warning her not to have sex too soon as it would "mean something very different to guys than it would to her."
The little girl who appears at the beginning saying, "What's the big idea?" and again saying the "I went walking..." part is Mika's cousin. She got the star treatment during recording sessions, as she was put up in a fancy Hollywood hotel.
At the beginning of 2007, the chart rules were changed allowing downloads to be eligible for the chart with or without a physical equivalent. While "Blag, Steal And Borrow" by KOOPA became the first song to chart without ever being released physically, this became on February 11 2007 the first track from a newly released album to register enough sales to enter the Top 75. It was officially the 62nd best selling "single" in the UK that week despite only being an album track.
The song is featured in a key scene in Pitch Perfect 2 sung by the Treblemakers. Mika commented to Billboard magazine: "It's just funny how things happen, you know? Music syncs, film and television for me have been such a powerful engine, and the reach of that stuff just around the world is a massive, massive part of my career as a writer."
"And it's funny that in America, where I'm the least commercial of artists in a sense, compared relatively to my other markets, it also offers me the biggest opportunities and platforms for my music. It just shows you, the one thing about my career - it shows you there are a million ways to crack an egg. There's so many ways to form a career in today's landscape, and it just takes a lot of work, a lot of legwork."