For me, yes it increases sensitivity! It feels GREAT! It was done in a tattoo/body piercing shop. My Mrs was there the whole time which made the experience phenomenal! I was asked to just unzip and pull down a little. Instead, I stripped totally nude and the guy (the woman was not working that day, sadly) was giving a little extra attention to "finding the site" for the piercing, I think. Lying there nude while she was watching him handle my dick and talking about his own frenny piercing was such a turn on!