It is called saline play .. an off shoot of BDSM medical play. The ball sac is filled with steril saline, it is not very dangerous, if done by a practiced hand. The balls become very cold and the sensation is something that is difficult to discribe.
The solution absorbs back into the body in aprox 48 hours.
It can also be done, so I'm told to a Woman's labia.
I will admit, as a gal who loves teabaggin' them balls feel so .. yummy.
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