Remembering that a woman can conceive only one or two days per month, we can only guess how high the failure rate must be in preventing V.D.(Venereal disease), which can be transmitted 365 days per year.〔【出典】Hiragana Times, 1993年7月号◆【出版社】株式会社ヤック企画 〕"HT081040", "2437408"