In 2017, Substance Is In. Casual Sex Is Out.
OkCupid
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Similar to Mark I wonder about a maturation bias here. 8 years ago an online dater might have been a more niche audience than they are now. So, maybe in 2008 the people who sought mates online were more into hook-up culture, and now it’s a broader segment of the population who date online. The conclusion that your users have changed in values is right, but maybe the extrapolation that people who date have changed isn’t quite supported.