| Cyberaffair | A romantic or sexual relationship initiated by online contact and maintained primarily via online communication.
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| Equity theory | A theory that states that people mentally calculate the benefits and costs for them in a relationship; their behavior is then affected by whether they feel there is equity or inequity, and they will act to restore equity if there is inequity.
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| Extramarital sex | Sexual activity between a married person and someone other than that person's spouse; adultery.
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| Hysterectomy (hiss-tur-EK-tuh-mee) | Surgical removal of the uterus.
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| Menopause | The cessation of menstruation.
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| Oophorectomy (OH-uh-fuh-REK-tuh-mee) | Surgical removal of the ovaries.
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| Polyamory | The nonpossessive, honest, responsible, and ethical philosophy and practice of loving multiple people simultaneously.
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| Prostatectomy (pros-tuh-TEK-tuh-mee) | Surgical removal of the prostate.
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| Singleism | The stigmatizing and stereotyping of people who are not in a socially recognized couple relationship.
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| Swinging | A form of extramarital sex in which married couples exchange partners with each other.
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