Abstract
Two new techniques for measuring deep scrotal temperature are described. Paraplegic men in wheelchairs have deep scrotal temperatures averaging about 0.9.degree. C higher than normal sitting men, and those whose scrotal temperatures are very high usually lack motile spermatozoa. Deep scrotal temperatures at constant air temperature are 0.5.degree. C lower wearing boxer shorts than wearing Y-fronts, and 1.2.degree. C lower wearing scrotal slit underpants than wearing boxer shorts; they are 1.6.degree. C lower sitting with thighs apart than sitting with thighs together, and 0.5.degree. C lower running than sitting with thighs apart. From such observations, means of lowering paraplegic deep scrotal temperatures can be designed.

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