| acquired immune deficiency syndrome (AIDS) | Sexually transmitted disease that destroys the body's immune system. Caused by the human immunodeficiency virus (HIV)
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| aerobic exercise | Sustained exercise (such as jogging, swimming, or cycling) that involves oxygen intake and that stimulates heart and lung activity
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| date or acquaintance rape | Coercive sexual activity directed at someone with whom the perpetrator is at least casually acquainted
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| emerging adulthood | Period of transition from adolescence to adulthood (approximately 18 to 25 years of age) that involves experimentation and exploration
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| flow | Heightened state of pleasure experienced when we are engaged in mental and physical challenges that absorb us
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| postformal thought | Form of thought that is qualitatively different from Piaget's formal operational thought; understanding that the correct answer to a problem can require reflective thinking and can vary from one situation to another
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| rape | Forcible sexual intercourse with a person who does not consent to it
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| sexually transmitted infections (STIs) | Diseases that are contracted primarily through sexual contact
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