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Thus, the concept of marriage is changing widely in many countries.
Behavior patterns are generally unwritten and constantly changing.With the use of modern technology, people can date via telephone or computer or meet in person.Dating may also involve two or more people who have already decided that they share romantic or sexual feelings toward each other.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.
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.