《初吻》的主题曲是 《Reality》，由Richard Sanderson演唱。这首歌也是1980年克劳德·皮诺托执导的电影《La Boum》的主题曲，并且是苏菲·玛索的成名作。歌词中表达了一种在梦境和现实之间徘徊的感觉，以及对美好憧憬的追求。以下是这首歌的部分歌词：

```

Met you by surprise, I didn't realize

That my life would change forever

Saw you standing there, I didn't know I cared

There was something special in the air

Dreams are my reality, the only kind of real fantasy

Illusions are a common thing

I try to live in dreams

It seems as if it's meant to be

Dreams are my reality, a different kind of reality

I dream of loving in the night

And living seems alright

Although it's only fantasy if you do exist, honey don't resist

Show me a new way of loving

Tell me that it's true, show me what to do

I feel something special about you

Dreams are my reality, the only kind of reality

```

这首歌曾成为15个国家的冠军歌曲，并在欧洲和亚洲售卖了800万张。