“The Wolf (who, BTW, has gone “mixed swimming” — alone with his wife). “
For the 10000000th time: MIXED SWIMMING IS ASSUR. You cant swim mixed – even with yur wife. And yes I have a source — the Kedushas Shoshanim perek 17 seif 4 sez yur not aloud to look at yur wife when shes undressed even when tahor. Unless you swim fully clothed yur oiver on that. Theres no reason to say that theres an exception to mixed swimming with yur wife, just liek theres no exception to lashon hara with yur wife, or eating kosher with yur wife or any other mitzvah.