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New types of relationships formed; it was possible for people to live together without marrying and without children.
Information about human sexuality grew, and with it an acceptance of all types of sexual orientations is becoming more common.
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.
However, one particularity of the human species is that pair bonds are often formed without necessarily having the intention of reproduction.
Humans have been compared to other species in terms of sexual behavior.Prior to that, courtship was a matter of family and community interest.Starting around the time of the Civil War, courtship became a private matter for couples.Social rules regarding dating vary considerably according to variables such as country, social class, race, religion, age, sexual orientation and gender.Behavior patterns are generally unwritten and constantly changing.
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.