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Neurobiologist Robert Sapolsky constructed a reproductive spectrum with opposite poles being tournament species, in which males compete fiercely for reproductive privileges with females, and pair bond arrangements, in which a male and female will bond for life.

These species-particular behavior patterns provide a context for aspects of human reproduction, including dating.

Information about human sexuality grew, and with it an acceptance of all types of sexual orientations is becoming more common.

From about 1700 a worldwide movement perhaps described as the "empowerment of the individual" took hold, leading towards greater emancipation of women and equality of individuals.

Men and women became more equal politically, financially, and socially in many nations.

Cars extended the range of dating as well as enabled back-seat sexual exploration.

In the mid-twentieth century, the advent of birth control as well as safer procedures for abortion changed the equation considerably, and there was less pressure to marry as a means for satisfying sexual urges.

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