I went to a friend who's a girl and asked her, 'What's it like to have sex for the first time, if you're Irish – so you're modest, and it's the 1950s – so you've never seen it in a film?' I listened carefully to what she said, and I put it in the book. It was an important element, the detail was richly memorable for the person, it had to be in the book.

On a heterosexual sex scene in Brooklyn. Let's not talk about sex – why passion is waning in British books, The Guardian (16 October 2010)