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What is Pederasty and explain in detail?
Pederasty or paederasty (US:  or UK: ) is a sexual relationship between an adult man and a pubescent or adolescent boy. The term pederasty is primarily used to refer to historical practices of certain cultures, particularly ancient Greece and ancient Rome.
In most countries today such relationships are illegal. The local age of consent determines whether a person is considered legally competent to consent to sexual acts, and whether such contact is child sexual abuse or statutory rape. An adult engaging in sexual activity with a minor may be considered abusive by medical authorities for a variety of reasons, including the age of the minor, the likelihood of the minor developing one or more mental disorders, such as post-traumatic stress disorder, physical injury to the minor, and the minors propensity for further victimization in adulthood.

Etymology and usage
Pederasty derives from the combination of Ancient Greek: παίδ-, romanized: paid-, lit. boy, child (stem) with ἐραστής, erastēs, lover (cf. eros). Late Latin pæderasta was borrowed in the 16th century directly from Platos classical Greek in The Symposium. (Latin transliterates αί as æ.) The word first appeared in the English language during the Renaissance, as pæderastie (e.g. in Samuel Purchas Pilgrimes), in the sense of sexual relations between men and boys.
The Oxford English Dictionary defines it as "Homosexual relations between a man and a boy; homosexual anal intercourse, usually with a boy or younger man as the passive partner".

History
Ancient Greece
Pederasty in ancient Greece was a socially acknowledged romantic relationship between an adult male (the erastes) and a younger male (the eromenos), usually in his teens