US writer David Guterson has won the annual Bad Sex In Fiction Award for his account of a mother and son having sex in a shower.

He beat the likes of Stephen King with the scene from his novel Ed King, a modern version of the fable of Oedipus.

"Oedipus practically invented bad sex, so I'm not in the least bit surprised," BBC News quoted Guterson as saying.

The author, who is based in the US, was unable to attend the prize ceremony at the In and Out Naval and Military Club in London.

Instead, EastEnders star Barbara Windsor presented the award to his publishers.

The ceremony is now in its 19th year, having been established by Auberon Waugh in 1993.

The award is run by The Literary Review, which says its purpose is to 'draw attention to the crude, tasteless, often perfunctory use of redundant passages of sexual description in the modern novel, and to discourage it'.