Sexual Relationships 
Sexual Health +1 y
Why do ballsacks get really tight?
Anonymous
Why do nutsacks get really tight and wrinkly sometimes and sometimes it becomes loose and jangly?
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What Girls & Guys Said
7 22the nuts need to be the right temperature to make sperm. if they're too warm, they'll hang loose away from the body heat so they're cool.
if they're too cool, they'll get close to the body to get warmer.
they also usually tighten up when we get a boner, though not always.
Based on temperature. If it is cold, they pull close to the body. If warm, they drop away from the body to cool. Sperm are temperature sensitive. This helps the body regulate.
Well mine gets tight cause it's always full of cum
I'm pretty sure because when they're hot they become loose and when they're cold they become tight.
Ball expert ^ :P hahah