The testicles need to be warmed for at least 15 hours a day to reduce fertility. This leaves around 9 hours for non-wear, during which sperm production might occur.
This is not a problem, but extended periods of non-wear (more than 24 hours) can lead to increased sperm production.
9 hours of non-wear seems to be a good balance without exceeding the contraceptive threshold of 1 million sperm/ml.
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