Avoiding 'not tonight honey, I have a backache': studyResearchers identified certain sex positions as less likely to trigger lower-back pain, but said that choosing the best ones depends on the type of pain the men experience. “The patient with their physical therapist or whoever their primary care provider is will work out which category of back pain they fall into,†said the study’s senior author Stuart McGill, who directs the Spine Biomechanics Laboratory at the University of Waterloo in Ontario.
Source: Avoiding 'not tonight honey, I have a backache': study (http://news.yahoo.com/avoiding-not-tonight-honey-backache-study-210807523.html)