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As humans societies have evolved from hunter-gatherers into civilized societies, there have been substantial changes in relations between people, with perhaps one of a few remaining biological constants being that both adult women and men must have sexual intercourse for human procreation to happen.
The study by Thomas, Rosenfeld, and Hausen finds that the share of couples meeting online has just about doubled since 2009.
Dating as an institution is a relatively recent phenomenon which has mainly emerged in the last few centuries.
From the standpoint of anthropology and sociology, dating is linked with other institutions such as marriage and the family which have also been changing rapidly and which have been subject to many forces, including advances in technology and medicine.
Instead of meeting our partners in school, at work, or through friends and family, many of us now meet them online.
Some 39% of heterosexual couples that got together in the US in 2017 met online, according to a recently released study (pdf) by sociologists Michael Rosenfeld and Sonia Hausen of Stanford University and Reuben Thomas of University of New Mexico.