New sex advice for back patients

Experts have mapped out the best ways for men with bad backs to have sex.

Contrary to popular belief, "spooning" is not always the best position for those who suffer back ache, researchers have found.

Instead, "doggy-style" sex may work better for many couples, they said.

Scientists at the University of Waterloo in Ontario, Canada, documented precisely how the spine moves during sex.

The researchers analysed information gathered by infrared and electromagnetic motion capture systems which