They give the appearance of a smaller waist, bigger hips, a bigger butt and longer legs. That's because high cuts accentuate the female figure.
That the one in the high cut oozes more sexuality. Men and women don't realize this, but all things being equal in appearance within a group of women, we will undoubtedly think that the one in the high cut is the most attractive. I don't care about race, ethnicity or body type - if there is any sign of a high cut being worn I'm posting it. I love women in high cut: thongs, leotards, bodysuits, bikinis, swimsuits, teddies, panties, tan lines, etc.