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 is a stage of romantic relationships in humans whereby two people meet socially with the aim of each assessing the other's suitability as a prospective partner in an intimate relationship or marriage.

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These people will have dates on a regular basis, and they may or may not be having sexual relations.

This period of courtship is sometimes seen as a precursor to engagement.

Behavior patterns are generally unwritten and constantly changing.

There are considerable differences between social and personal values.

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.Thus, the concept of marriage is changing widely in many countries.Historically, marriages in most societies were arranged by parents and older relatives with the goal not being love but legacy and "economic stability and political alliances", according to anthropologists.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.Humans have been compared to other species in terms of sexual behavior.Today, the institution of dating continues to evolve at a rapid rate with new possibilities and choices opening up particularly through online dating.