Dr. Shafeike comes college of medicine of Egypt Caire university nearly 20 years to pursue the man all the time not Yo research. He from " textile type generates to spermatozoon, the influence of the gravid activity that reach a gender " the discovery in research: Compare with photograph of pure cotton briefs, briefs of blending of half chemical fibber can let chemical fibber briefs, half cotton spermary temperature rises quickly, level of the hormone inside blood is remarkable also abnormal. Wearing this kind of briefs after 14 months, male spermatozoon amount decreases apparently, sexual desire also can be reduced. And in shuck off chemical fibber briefs 4, after 8 months, it is normal that the spermary of these males and spermatozoon state restored again.

Visible, briefs became male barren one big murderer. The expert thinks to look from briefs appearance, no matter age size, pants of comfortable a straight angle is most the benefit option at reproductive health. Nevertheless, some males ham is thicker, manacle their ham closely to avoid pants of a straight angle, raise pubic skin temperature, block up blood circulates, can choose relatively comfortable triangle briefs.