[Avodah] When does mixed swimming mean?

[SBA]

From: "Michael Makovi" < >
A friend of mine recently learned that there is no issur of mixed
swimming per se, and asked why then do we avoid it? I replied to her:

>>>>
Actually, it makes a LOT of sense. There's no halacha for davka
swimming; rather, you have halachot of tzeniut, which applies to
swimming no more than to shopping at the mall. Why should the addition
of water change anything?
>>

Actually the addition of water seems to add quite a bit to it all.

See the last page of Gittin [90b]: 
"Middas adam ra sheroeh es ishto...verochetzes im bnei adam."

"Im bnei adam salka daatach!?"

[Peirush Rashi: "Im kein raglayim ledavar shezonah hi, ve'asurah lo".

Tosfos: "Afilu adam ra eino sovel zeh me'ishto...afilu kala shebekalos eino
oseh ken.."]

"Ela bemakom shebnei adam rochtzin - zu mitzva min haTorah legarsho"

No issur of mixed swimming!? My foot!!

SBA

PS: The SR zt'l once said pshat in "Im bnei adam salka daatach!?"
- How can you call persons who engage in mixed swimming "bnei adam" ??

SBA