Holy crap - if I knew I was fucking a woman who regularly used one of these, I'd be worried her snapping my dick off. It's a 'pelvic wall exerciser', which lets a woman go all thighmaster with her vaginal muscles, to improve her sexlife, and presumably that of her beau's as well. In that case, I suppose I'd like to be with someone who uses it...but if she can crack walnuts with her pelvic wall, some caution may be advised.