PIP: The vasectomy technique of Dr. Hee Yong Lee, deliberately designed to allow for the possibility of reversibility, is described. This Korean method involves reversible vas occlusion obtained through insertion of non-reactive and non-absorbable suture materials into the vas. This vas plug is 1 to 2 cm. in length and has two 8 cm. strings of filiform silk attached to one end. The filiform threads enhance easy insertion without cutting the vas, prevent migration of the plug, and avoid the need for an incision in the vas for removal of the plug. A 3-4 cm. length of vas is exposed under local anesthesia and the plug is inserted into the vas by means of a straight needle threaded with the filiform threads. The filiform threads are then loosely tied around the vas. The plug is removed by cutting and then pulling the filiform threads with a pair of mosquito forceps. Twenty of 350 men who had the plugs inserted were subjected to reversibility about 6 months later. Viable sperm specimens were obtained a month after removal of the plug in 17 of the 20. In 2 of the 3 other cases, the vas was accidently cut during removal. In the third case, fibrosis was noted around the plug. Nearly all vasectomies can be reversed if care is taken with the original procedure. Dr. V. N. Shrikhande's vasectomy technique in India is also described. Less than a one cm. segment of the vas is removed. The cut ends are crushed and ligated with fine non-absorbable sutures. The lower cut end is buried within the connective tissue sheath by non-absorbable sutures. This Indian doctor reports that a reversibility rate of over 90% is possible. Three pitfalls of vasectomy reported are: a long segment of the vas unnecessarily removed, excessive close stripping of the vas, and the vas divided too low down near the head of the epididymis.