Thus, the concept of marriage is changing widely in many countries.
Men and women became more equal politically, financially, and socially in many nations.
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.
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.
Dating as an institution is a relatively recent phenomenon which has mainly emerged in the last few centuries.