The primary reason you might find it difficult to urinate when sexually aroused is due to physiological changes affecting your urethra.
Here's a breakdown:
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The Urethral Sponge: Around the urethra (the tube that carries urine from your bladder), there's a tissue called the urethral sponge.
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Swelling During Arousal: When you become aroused, blood flow increases to the pelvic region. This causes the urethral sponge to swell.
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Urethra Compression: This swelling compresses the urethra, making it harder for urine to pass through. Think of it like a temporary kink in a hose. The swelling essentially acts as a barrier, preventing urination.
In essence, your body temporarily prioritizes sexual function, which can lead to a temporary impediment in urinary function.