It’s not actually the water that makes it sticky, it’s the change in temperature.
When sperm is ejaculated, it is mixed with a fluid called seminal plasma. This fluid helps to keep the sperm alive and protected. At body temperature, the seminal plasma is thick and viscous.
When exposed to hot water, the proteins in the seminal plasma start to denature (change shape). This makes the fluid less viscous, and therefore the sperm becomes sticky.
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