I have been reading about the negative effect that wearing tight underwear can have on sperm production. I also discovered that regular sauna use has also been shown to lower sperm production, the common factor between the "hyperthermic effect". (the same is apparently true of too much exercise).
I am just wondering, is the hyperthermic effect of activities which heat the body and kill sperm something which degrades one's sexual energy, understood esoterically? Alternatively, is it a physical expression of an esoteric process (i.e. whereby the use of the 'inner heat' or transmutation alleviates anger, lust and other negative emotions?) In other words, is the uncomfortable build-up of sexual energy in the lower centres reduced by the heating of the testes? Does transmutation similarly involve a partial heat-death of the physical sperm? I am reminded of the Taoist practice of preventing the overflowing of the Jing by using transmutation to boil it and convert it into Shen (steam)