Ben Wa balls are used by inserting them into the vagina and using the pubococcygeus muscles to hold them in, stimulating movement and/or vibration. Ben Wa balls should not be confused with anal kegel exercisers and prostate stimulators. Usage of Ben Wa balls creates a subtle stimulation, not meant to bring the user to immediate orgasm but rather to tease. It is possible to leave Ben Wa balls in one's vagina all day or use them while seated in a rocking chair, for an effect that some find pleasurable. Health experts caution against the prolonged placement of foreign objects in the vagina due to the risk of infection. Ben Wa balls may also be used to increase the strength of the pelvic floor muscles, much as Taoist sexual practices have been used for centuries, and the Kegel exercises are used today. Similar to Kegel exercises, Ben Wa balls and other shaped vaginal weightlifting equipment are recommended by gynecologists and obstetricians to increase vaginal elasticity and bladder control. Vaginal weights come in a spherical shape and are used in increasing weights to strengthen the vagina, which improves sexual performance and benefit your body. Kegel exercise involves repeatedly contracting and relaxing the muscles that form part of the pelvic floor, now sometimes colloquially referred to as the Kegel muscle. The proper exercise can be performed multiple times each day, for several minutes at a time, but takes one to three months to begin to have an effect.