Sex magic is a term for various types of sexual activity used in magical, ritualistic or otherwise religious and spiritual pursuits. One practice of sex magic is using the energy of sexual arousal or orgasm with visualization of a desired result. A premise of sex magic is the concept that sexual energy is a potent force that can be harnessed to transcend one's normally perceived reality.

The earliest known practical teachings of sex magic in the Western world come from 19th century American occultist Paschal Beverly Randolph, under the heading of The Mysteries of Eulis:

If a man has an intelligent and loving wife, with whom he is in complete accord, he can work out the problems [of how to achieve magical results] by her aid. They are a radical soul-sexive series of energies...The rite is a prayer in all cases, and the most powerful [that] earthly beings can employ...it is best for both man and wife to act together for the attainment of the mysterious objects sought.

Success in any case requires the adjuvancy of a superior woman. THIS IS THE LAW! A harlot or low woman is useless for all such lofty and holy purposes, and just so is a bad, impure, passion-driven apology for a man. The woman shall not be one who accepts rewards for compliance; nor a virgin; or under eighteen years of age; or another's wife; yet must be one who hath known man and who has been and still is capable of intense mental, volitional and affectional energy, combined with perfect sexive and orgasmal ability; for it requires a double crisis to succeed...

In biology, sexual reproduction is a process of combining and mixing genetic traits, often resulting in the specialization of organisms into a male or female variety, each known as a sex. Sexual reproduction involves combining specialized cells (gametes) to form offspring that inherit traits from both parents. Gametes can be identical in form and function (known as isogametes), but in many cases an asymmetry has evolved such that two sex-specific types of gametes (heterogametes) exist: male gametes are small, motile, and optimized to transport their genetic information over a distance, while female gametes are large, non-motile and contain the nutrients necessary for the early development of the young organism.

An organism's sex is defined by the gametes it produces: males produce male gametes (spermatozoa, or sperm) while females produce female gametes (ova, or egg cells); individual organisms which produce both male and female gametes are termed hermaphroditic. Frequently, physical differences are associated with the different sexes of an organism; these sexual dimorphisms can reflect the different reproductive pressures the sexes experience.

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