Hello and welcome to HCM. As an Urologist, i can understand your concern. Sperms are formed in the testis. Heat is a known factor, to decrease the formation of sperms. Especially before IUI,it may have been advisable to avoid heat for a month. The exact effect of the heat over a month, is difficult to quantify,as is the effect on spermatogenesis. It ll depend also, on the semen report. If you have any doubt,send the report to me,as a direct question. Dr.Matthew J. Mangat.