Earlier quoted context omitted.
Not sure why getting downvoted. To dismiss out of hand thousands of years of evolution and think the last 50+ years of modern societal change can completely counteract biological forces is.. wishful thinking? I mean, this explanation is at least as good as any other speculation in this thread.
I did not downvote the parent. My claim: almost every human adult has had at least one sexual partner. I can only find decent studies surveying modernity, but for example: http://www.nbcnews.com/id/19374216/ . Assuming most humans having sex is not a recent development, any evolutionary pressures, if they exist at all, on the sexually active population are unclear at best; however, there may be pressures against the…
"After a study by the National Institute of Population and Social Security Research last year found a massive increase in the number of virgins in [Japan], some academics criticised the way the research was reported.
Of 5,000 single people surveyed, the government department found 42 per cent of men and 44 per cent of women had never had sex."
http://www.independent.co.uk/news/world/asia/japan-couples-s...