The term "boy" is primarily used to indicate biological sex distinctions, cultural gender role distinctions or both. The latter most commonly applies to adult men, either considered in some way immature or inferior, in a position associated with aspects of boyhood, or even without such boyish connotation as age-indiscriminate synonym. The term can be joined with a variety of other words to form these gender-related labels as compound words. Ongoing debates about the influences of nature versus nurture in shaping the behavior of girls and boys raises questions about whether the roles played by boys are mainly the result of inborn differences or of socialization. Images of boys in art, literature and popular culture often demonstrate assumptions about gender roles.

Etymology

The word "boy" is recorded since 1154. Its etymology is unclear; it is probably related to East Frisian boi, Old Norse bófi, Dutch boef "(criminal) knave, rogue" and German Bube; but an unrecorded Anglo-Saxon word boia = "boy or servant" (possibly from Old French embuié, servant, past participle of embuier, to fetter) has been theorized to explain the etymologies of the English placenames Boycott and Boyton as Anglo-Saxon Boia cot "the cottage of the boys or servants" and Boia tūn "the farm of the boys or servants".

Scope

An adult male human is a man, but when age is not a crucial factor, both terms can be interchangeable, e.g., 'boys and their toys' applies equally to adults and young boys, just as 'Are you mice or men?' can also apply to young boys.

In some traditions boyhood is held to be exchanged for adult manhood, or at least approach it significantly, by certain -in se independent- acts assuming a role deemed to be typical for a "normal" man (though there are limits) as marriage, fathering offspring or military service. Various cultural and/or religious rites of passage serve, partially or specifically, to mark the transition to manhood.

There is often a number of traditional differences in attire between boys and adult men, which may even give rise to a metaphoric term such as broekvent in Dutch (i.e., a boy who has not yet "graduated" from shorts to trousers) and in what is socially accepted as appropriate behaviour, e.g., boys may be publicly seen naked in cultures where men are not.

In English, the words youth, teenager and adolescent may refer to either male or female. No gender-specific term exists for an intermediate stage between a boy and a man, except "young man", although the term puberty, for one who reached sexual reproductivity (or the legally assumed age, e.g. 14 for boys, often set lower for girls) without being a legal adult yet, stems from a Latin word for boys only, itself named after the accompanying male body hair, pubes, on face and genital region.