Adolescents, emerging adults, men and women engage in hookups for a variety of reasons, which may range from instant physical gratification, to fulfillment of emotional needs, to using it as a means of finding a long-term romantic partner.During the twenty-first century paid sex was not considered to belong to the category of casual sex; however, in the 1900s-1930s there was more to paid sex than simply the exchange of money–it was a contact between humans without the ties of a relationship.

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Garcia and others have noted that the "past decade has witnessed an explosion in interest in the topic of hookups, both scientifically and in the popular media.

Research on hookups is not seated within a singular disciplinary sphere; it sits at the crossroads of theoretical and empirical ideas drawn from a diverse range of fields, including psychology, anthropology, sociology, biology, medicine, and public health." The hookup culture is vaguely defined due to a variety of perspectives taken on this subject related human sexuality.

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co.

When Andrew Marcus, the 27-year-old CEO and founder of My Tennis Lessons.com, was in need of a new tennis pro for his sports coaching startup in 2013, he immediately logged on to Linked In.

“If sharing career interests or finding a significant other who is successful professionally is important to you, it is an amazing resource,” says Roy Cohen, a career counselor, executive coach and author of “The Wall Street Professional’s Survival Guide.” “Think about Linked In as a starting point in terms of getting to know someone, first on a professional basis and then, if there is something more — a spark — allowing it to morph,” says Cohen.

That’s what happened with Katie Doble, vice president at staffing firm the Creative Group.

“I was curious if I could beat her,” says Marcus, the former captain of the UConn tennis team. But she had a pretty good idea of whom she was dealing with, as she’d done research on her own after viewing his Linked In credentials.

After the pair exchanged several messages on Linked In and Marcus did some due diligence — such as finding Alda’s photo online — he invited her to bat a few balls around on a local tennis court. The two, both based in Texas, hit it off, and have been dating ever since.

Technological advancements such as the automobile and movie theaters brought young couples out of their parents' homes, and out from their watchful eyes, giving them more freedom and more opportunity to engage in sexual activity.