[My friend nextworldover wrote this as a Reddit comment in response to a person who grew up conservative Christian and did not know anything about sex. I thought it was an excellent explanation of how sex works and asked to post it as a guest post.]
People have sex for many reasons, the most common of which are pleasure, bonding, and reproduction. Stimulating erogenous zones (including genitals but also other sensitive areas on the body) feels pleasurable to most people, and can relieve sexual arousal. Sex is often an intimate and vulnerable experience, which many people find deepens their emotional bond with their romantic partner. Sex is also the way that we conceive children.
Pleasure: When aroused, the genitals generally become engorged. For a penis, this is visible as an erection. For a vulva, this is visible as the labia and clitoris swelling and appearing flushed. Arousal also…
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