It's really possible to hard beaten a pair of boobs without any danger. The best is to FRICTION them with stinging nettles as my lovely 3rd wife requested regularly every Saturday in full sunshine : two men publicly worked her breast (one of each udder)and she never hesitate to say "harder, much harder for me" furthermore a large tuft of nettles was placed between her thighs in order to "burn" her largely opened vagina.