No sex in the city: All over the developed world, people are having sex less frequently, for reasons largely unknown. http://journals.sagepub.com/doi/abs/10.1177/1363460718785108?journalCode=sexa …pic.twitter.com/5Tu8OXWg9j
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In general terms, an increase in the female influence on relationships is also my first and best guess, based on evolutionary psychological thinking.
Haha, just reposted my tweet with a typo corrected. 
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