85% of men and women will have back pain at some point in their lives. In people with chronic back pain, nearly 50% reported decreased sexual performance and enjoyment. Back and Spine expert Stuart McGill from McMaster University in Canada, and co-workers, found that doggy-style sex is the least stressful to the male spine, while the missionary position is least stressful to the female spine. As a compromise, doggy-style sex with weight supported on the forearms is best for minimizing spinal stress in men and women when both have back pain.