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If you're trying to get pregnant you'll be keen to know how you can boost your chances.
Researchers used scanners to show what is going on in two positions: missionary and doggy style.
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However, Dr James Goldfarb, director of the infertility service at the Cleveland Clinic in Cleveland, Ohio, said women shouldn't worry too much about positions.
'Very rarely, a woman's cervix is in an unusual position where certain positions can make a difference,' he told Web MD.
The scans confirmed that the tip of the penis reaches the cervix in both of these positions – and doggy is the deepest.
A team from CMC Beau Soleil in France took MRIs of couples in the missionary position, which discovered it allows the penis to reach the area at the front of the cervix.
Experts at Birmingham University found women undergoing fertility treatment were 33 per cent more likely to have a baby if their vitamin D levels were healthy.