Singer Keith Urban has written a very racy song about oral sex.

The new song of Nicole Kidman’s husband is entitled ‘Falling’ and was given to American Idol winner Trent Harmon to perform it.

The song says: ‘You slide your fingers through my hair and tell me take it slow.

‘And I know you want/And so I go down on my knees/I’m here to please.’

Trent told Rolling Stone he was shocked when he learned what he would sing.

‘We were listening (to the demo) and reading through the lyric sheet and I said, ‘Oh, wow. Cool, bro!’ the 25-year-old told the magazine.

‘I really didn’t know what to say … You’ve got to grow up sometime.’

On the big night, Trent decided to only sing the first verse and leave the saucy second verse of the song out. However, on the official release of the single, the second verse is intact, as Daily Mail mentions.