WARNING:
   On 4/22/11, about a year after discontinuing the testicular heating started in November, 1998, I received results of my semen analysis which indicated that the method is not completely reversible. The abnormalities were low motility (<1% rather than >60%), high abnormal morphology (60% rather than <40%) and low count (16 million/mL rather than >19 million/mL). Until this result, every other report suggested that the heating method was fully reversible.

  Excerpts from some excellent research papers can be selected below:

      A 1994 French study of contraceptive underwear (in English).

      Sperm production can be stopped for months using hot baths.

  Full Papers:

      A long report of using hot baths for contrception in India.

      A short report of using hot baths for contrception in India.

      A 1997 French study of the effect of body heat on spermatogenesis (in English).

  Links:

      A review of research on contraceptive suspensories.

      Three new methods for male contraception.

      Microscope equipment specifically designed for sperm count measurement.