I too got my education at adult bookstores. I learned just how small my cock was compared to others. I also learn how submissive I was; the first a cock came through the hole, the voice told me to "stroke it". I did just that and got my hand covered in the sticky white goo. I remember smelling it and licking my hand as I jerked myself later when I got home. The next time, a different voice invited me to "lick the head". I did, and eventually took the knob into my mouth. I was promptly rewarded with a mouthful of warm jizz. The nasty taste stayed with me all day. It wasn't long before I "unlocked the door" as the voice demanded. In the booth, the strangers were able to hold me by the back of my head or by the hair and properly fuck my face and throat. Some guys would paint my face with cum and make me leave without even wiping it off. This way, the other men that saw me exit the cubicle knew I was a cocksucking faggot.