Mixed Swimming
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It is clear (and unanimous) that mixed swimming is forbidden. The ban for which derives from several sources.
The first source is the Talmudic passage that says that it is forbidden for a man to watch women do laundry. This is because, when the women did the laundry, they would roll their clothes up high on their body in order to avoid getting wet. It is forbidden to gaze at those parts of the body that would become exposed as a result. Another passage teaches that men who gaze at women in the river “lose their share in the world to come.” Another passage teaches that one who allows his wife to go mixed swimming is “evil.” Finally, there is a passage that teaches that a woman who bathes in the presence of men should be divorced.
Based on the above, it is clear that mixed swimming is forbidden.
There is a difference of opinion on the severity of the issue of women looking at men not properly dressed. Everyone agrees, however, that it is unbecoming for an observant woman to go mixed swimming. As such, there is little dispensation for women to go mixed swimming even if they were to be fully clothed.
There is much discussion as to the age at which the ban on girls swimming with boys begins. We hold that it begins at 3 years. The same is true with boys swimming with girls.
It is also worth mentioning that women are not allowed to swim if being watched by a male lifeguard unless they are fully clothed.