I loathe, detest and despise anything high-cut. I think the style was first developd for dancers, like the Rockettes or Las Vegas showgirls (whose legs are already six feet long to start with) to make their legs look longer. From there it morphed into swimsuits, and then on to underwear. The most damned uncomfortable panties I have ever tried, digging in to all the places I don't want dug into, not to mention leaving very visible lines on outer clothing. Mind you, I simply didn't believe dd when she used to say that thongs were comfy!
I was lucky last summer. A local moderately upscale department store was having a 40% off sale on swimsuits, so I went and got one. The first few I tried were disastrous, with - yes indeed - high cut legs. Also, with crossover style bodices, which I felt sure I would fall out of when wet. Finally, I found one with a well-covered seat and a moderatly high, straight-cut bodice which only shows a little cleavage. No risk of fallout at either end. It came home with me.
Olwyn Mary in New Orleans