Basic Love Balls silverHold him tightly during sex! There are weights inside both of the love balls that rotate every time you move. On the one hand these weights can stimulate the vagina and on the other hand they can be effective training for the pelvic floor muscles. The muscles have to be tense to hold the balls in the vagina. Your pelvic floor will be strengthened if you train regularly and this will mean that you can tense and relax your muscles whenever you want, e.