Sep 10, - When your back hurts, sex can be more pain than pleasure. But there might be a way to stay in the game: New research from the University of. Sep 10, - However, for extension-intolerant men – meaning men who feel pain when they arch their back – this may be a comfortable position. Sexual Position: mSIDE, also known as spooning or sidelying. In this position, the woman and man are both lying on their left sides, and the man is behind her.