Yes, Ben Wa balls are safe in water. For more information visit ben-wa-balls.org/ben-wa-balls-faq

Ben Wa balls are sexual toys. They consist of a ball within a hollow ball that moves randomly, making it difficult to get accustomed to the stimulation.

Ben Wa balls are used for sexual stimulation for adults. They are usually inserted and are thought to provide pleasure for the recipient. They offer no therapeutic relief.

Using a little lubricant insert one or two ben wa balls into the vagina, and practice holding them in place.

Practice contracting the muscles that hold the balls in place, without contracting the anus or abdominal muscles. Most women hold the ben wa balls in the lower 2 inches of the vagina, although some prefer to place them closer to the g-spot for stimulation.

Some ben wa extra sensation. There are women who experience pleasure and even orgasm from ben wa balls, but most use them to help isolate the PC muscles, and practice kegel exercises.

The balls that are designed to stimulate through delicate internal movement can be worn during daily activities, and many women report that a pleasurable sensation can created by rocking while using ben wa balls.

It would depend on the size of the balls, and the size of the rectum in question.