Changes in relationship formation and dissolution in the past 50 years have revealed new patterns in romantic relations among young adults.The US Census indicates that young people are choosing to marry later and cohabitating more often than past generations.These species-particular behavior patterns provide a context for aspects of human reproduction, including dating.However, one particularity of the human species is that pair bonds are often formed without necessarily having the intention of reproduction.In modern times, emphasis on the institution of marriage, generally described as a male-female bond, has obscured pair bonds formed by same-sex and transsexual couples, and that many heterosexual couples also bond for life without offspring, or that often pairs that do have offspring separate.Thus, the concept of marriage is changing widely in many countries.
As humans societies have evolved from hunter-gatherers into civilized societies, there have been substantial changes in relations between men and women, 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."As soon as couples live together, it becomes more difficult to break up," Jamison said."At that point, they have probably signed a lease, bought a couch and acquired a dog, making it harder to disentangle their lives should they break up.Staying over doesn't present those entanglements." Jamison found that couples who had a stayover routine were content in their relationships, but did not necessarily plan to get married or move in together."Many college-aged adults are students who will soon be facing a transition point in their lives," Jamison said.