Penile–vaginal intercourse in the context of "Egg cell"

Virginity is a social construct that denotes the state of a person who has never engaged in sexual intercourse. As it is not an objective term with an operational definition, social definitions of what constitutes virginity, or the lack thereof, vary. Heterosexuals may or may not consider loss of virginity to occur only through penile–vaginal penetration, while people of other sexual orientations often include oral sex, anal sex, or manual sex in their definitions of virginity loss. The term "virgin" encompasses a range of definitions, as found in traditional, modern, and ethical concepts. Religious rituals for regaining virginity exist in many cultures. Some men and women who practice celibacy after losing their virginity consider themselves born-again virgins.

There are cultural and religious traditions that place special value and significance on this state, predominantly towards unmarried females, associated with notions of personal purity, honour, and worth. Like chastity, the concept of virginity has traditionally involved sexual abstinence. The concept of virginity usually involves moral or religious issues and can have consequences in terms of social status and in interpersonal relationships. Although virginity has social implications and had significant legal implications in some societies in the past, it has no legal consequences in most societies today. The social implications of virginity still remain in many societies and can have varying effects on an individual's social agency.

The consummation of a marriage, or simply consummation, is the first officially credited act of sexual intercourse following marriage. In many traditions and statutes of civil or religious law, the definition usually refers to penile–vaginal penetration (i.e., heterosexual), and some religious doctrines hold an additional requirement prohibiting contraception. In this sense, "a marriage is consummated only if the conjugal act performed deposits semen in the vagina."

The religious, cultural, or legal significance of consummation may arise from theories of marriage as having the purpose of producing legally recognized descendants of both partners, or of providing sanction to their sexual acts together, or both, and its absence may amount to treating a marriage ceremony as falling short of completing the state of being married, or as creating a marriage which may later be repudiated. Thus, in some legal systems, a marriage may be annulled if it has not been consummated. Consummation is also relevant in the case of a common-law marriage. The historical importance of consummation has resulted in the development of various bedding rituals.

Sexual penetration is the insertion of a body part or other object into a body orifice, such as the mouth, vagina or anus, as part of human sexual activity or sexual behavior in non-human animals.

The term is most commonly used in statute law in the context of proscribing certain sexual activities. Terms such as "sexual intercourse" or "carnal knowledge" are more commonly found in older statutes, while many modern criminal statutes use the term "sexual penetration" because it is a broad term encompassing (unless otherwise qualified) any form of penetrative sexual activity, including digital (i.e., the fingers) or with an object, and may involve only the most minimal penetration. Some jurisdictions refer to some forms of penetration as "acts of indecency", or other terminology.