Most rabbis that I have spoken to or read their opinion in local newspaper articles have prohibited mixed swimming.
My understanding of this prohibition seems to mean that men and women should not be in the same pool or close proximity in the same body of water.
I am curious what would be considered "far enough" to avoid the problem. For example, would any of these scenarios avoid the problem?
Would a floating rope in a pool, lake or the ocean be sufficient, assuming each gender stays on his / her side of the rope? Would separate entries to the swimming area be needed?
What if there are two pools next to each other by a common walkway? These are considered separate distinct bodies of water.
Using a lake, there are two enclosed "docks" creating separate swimming areas for men and women, but they are in the same lake.
I am focusing specifically on the problem of swimming, and not any problems there might be of viewing women or men in bathing suits on their way to or from the swimming area itself. I understand that they may be related, but for purposes of this question, let's assume that this is handled by everyone having a robe, towel other covering In arm's reach to the swimming area.