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How to be superhuman: The science behind extraordinary abilities When will we hear from aliens? Each woman was asked to swab their vaginas every three months for a year, and to keep a record of any sexual activities. The women were all young students, and 19 had not yet experienced penetrative sex at the start of the study. Can we quit cobalt batteries fast enough to make electric cars viable? It is very likely that sex changes the vaginal microbiome, says Janneke van de Wijgert at the University of Liverpool, UK — although she warns that studies like this can be unreliable, because people often lie about sex. Hormonal contraceptives seem to promote a healthy community of bacteria, says van de Wijgert, and using condoms will protect the vagina not only from STIs, but from other bacteria too. Having sex with a male partner can disrupt the balance of bacteria in the vagina — which might put women at risk of infections.

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