I have never used one. I have looked into them to see who was on the other side. There always was an freeky looking guy or some fat guy. Never anyone Id let touch me.

And I have often heard my buds tell stories about guys sticking there coks through while they were on the other side. When the unsuspecting guy would put his cok in the hole they would light there lighters under the guys cok or slam his cok hard with there shoe! HEHEHHEE It sound slike an Adam Sandler movie HEhehehe

No way I'm going to use the services from anyone on the other side where I canot see whats going to happen to my favorite tool in the shead.