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http://www.eurekalert.org/pub_releases/2015-10/iu-iss100515.php
BLOOMINGTON, Ind. -- Research from Indiana University has found that sexual activity triggers physiological changes in the body that increase a woman's chances of getting pregnant, even outside the window of ovulation.
"It's a common recommendation that partners trying to have a baby should engage in regular intercourse to increase the woman's changes of getting pregnant -- even during so-called 'non-fertile' periods -- although it's unclear how this works," Lorenz said. "This research is the first to show that the sexual activity may cause the body to promote types of immunity that support conception.