I've been working with ball weights in order to stretch mine. Very long process and I don't do it as often as would be optimum. For me it is simply looks. As for sex, they still turtle, but now when they do they form a larger size ball. Again, it's a visual thing. One exception is when my wife is going down on me and I am wearing weights and/or a leather ball stretcher that don't allow them to turtle. When I am wearing weights or a leather ball stretcher, my PONR last longer, my orgasm is definitely more intense, and while I am cumming in her mouth as I play with my shaved balls - hot damn!!!