Scientists repeatedly watch 10 couples having sex to determine positions best for men with bad backs.

Chronic back pain is the worst, while having sex is the best! But what if having sex makes your back pain worse? Well, if you’re a man, take heart! A crack team of Canadian scientists set out to determine which sexual positions are most and least likely to worsen back pain. To do this, they observed ten heterosexual couples having sex in a variety of positions, and they measured the movements of the man’s back in each. The verdict? Well, it depends on the type of back problem you have. But i

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