In a magazine interview, she said: "Sex with Guy is incredible...and, surprise, surprise, it's his favourite song on the album. Actually, maybe it's not his favourite song but it's definitely his favourite line."The singer has made sex the centre of her public image ever since her first No 1 hit, Like A Virgin, in 1984. Since then, she has published a book of erotic photographs of herself called Sex, had the explicit video for Justify My Love banned by MTV in 1990 and kissed Britney Spears and Christina Aguilera at a music awards ceremony in 2003.
In recent months, however, Madonna has been dogged by rumours that her marriage is in crisis. Last month, the couple were forced to issue a statement denying a split, which read: "Mr and Mrs Guy Ritchie remain happily married."
She said: "I had to marry a challenge because otherwise I would just get bored. Whatever else Guy is, he's never boring... We're both there to help each other and challenge each other."
But she added that she was the one left to tell off their children, Lourdes, 11, Rocco, seven, and David, two.
"Guy's a softie with our kids," she said. "Lola [Lourdes] rules the roost. She is extremely maternal towards David. He is the apple of everyone's eye."
