The "tying up" method is a very very old method, used for the ancient times ! It is a very soft method for guys who have a short frenulum or who simply want to have no frenulum. It can be proceed on circumcised and uncircumcised penis. But on uncircumcised ones, it is perfect to have a really full retractation with no folds on shaft. It is ideal too, for vacuum pumping and PE with no risk of tearing of the skin. The only very important think you have to remind, is to disinfect locally , penis skin, needle, used thread and of course, your hands !