Do you dare paint your sack with sesame oil sans the Iodine ?? We already know lots of seed oils inhibit thyroid function, that ovarian tissue can make T4 and that testes and ovaries derive from the same primal tissues, so it wouldn't surprise me if I read that polyunsaturated oils when painted on the scrotum cause testicular atrophy. Dr Jonathon Wright of Tahoma has u-tube videos explaining transdermal scrotal administration