My wife saw a penis plug on some website last week and instructed me to build a couple for myself. The first one is fairly thin and has an 8mm bead on the end that is inserted into the hole. The bead blocks the sperm during ejaculation, making it VERY painful! The brass one is a lot thicker and didn't need the bead. My wife had me test them both, and I can tell you it was not a pleasurable time when I orgasmed. Having these in place can be as affective as my cock cage.
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