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Sexual intercourse - Wikipedia

The XY sex-determination system is the sex-determination system found in humans , most other mammals , some insects Drosophila , some snakes, some fish guppies , and some plants Ginkgo tree. In this system, the sex of an individual is determined by a pair of sex chromosomes. Females typically have two of the same kind of sex chromosome XX , and are called the homogametic sex. Males typically have two different kinds of sex chromosomes XY , and are called the heterogametic sex. In humans, the presence of the Y chromosome is responsible for triggering male development; in the absence of the Y chromosome, the fetus will undergo female development.
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“I’m XY and I Know It”: Sex Determination Systems 101

Being knowledgeable about anatomy and physiology increases our potential for pleasure, physical and psychological health, and life satisfaction. Beyond personal curiosity, thoughtful discussions about anatomy and physiology with sexual partners reduces the potential for miscommunication, unintended pregnancies, sexually transmitted infections, and sexual dysfunctions. Lastly, and most importantly, an appreciation of both the biological and psychological motivating forces behind sexual curiosity, desire, and the capacities of our brains can enhance the health of relationships.
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Sex is biologically determined based on chromosomes, hormones, gonads, internal reproductive anatomy, and external genitalia. In humans, biological sex is determined at birth, typically by doctors, through the observance of five factors:. In humans, sex is typically divided into male, female, or intersex.
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