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Description:The term coitus is derived from the Latin word coitio or coire, meaning "a coming together or joining together" or "to go together", and it describes a variety of sexual activities under ancient Latin names, but usually refers exclusively to penile—vaginal penetration. Lerner and Laurence Steinberg state that researchers also "rarely disclose how they define sex or even whether they resolved potential discrepancies in definitions of sex". A study by the Kinsey Institute examined the definition of sex based on a random sample of college students from 29 U. Another study by the Kinsey Institute sampled people, ranging in ages 18— Human mating strategies and Pair bond Copulation ranges from a purely reproductive activity to one of emotional bonding. For example, sexual intercourse and sexual activity in general often play a strong role in human bonding.

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