Madonna knew it in the 1980s. Britney or Jessica Simpson knew it in the 1990s. Paris Hilton knew it in the 2000s. The Kardashians have known it the past 15 years. Hugh Hefner knew it 70 years ago. Every model of consequence knows it.

The Kardashians are extraordinarily talented at selling sexuality. They know how to package it. They know how to market it. They intentionally replicated the system that worked so well for Kim, on to Kylie Jenner as she came of age.

Once you gain an initial position via your sexuality, leverage it into further gains. Sex rarely fails to sell.

And the parent is also correct in that it mostly (not exclusively) works for women, regardless of the downvotes attempting to change human nature and reality. A few male celebrities have benefitted tremendously from the effect, including Brad Pitt and Matthew McConaughey (how many famous male models can you name from the past 20-30 years though?).