Only 1% of all men earn a million a year. On average, each man has slept with 20 women.

20% of girls have really slept with men who earn a million a year. She will brag to her best friends about the most proud segment of her emotional life. Each person has 3-4 best friends, and of course, there are overlaps in counting, so let's count half of that. 20% + 20% x 4 / 2 = 60%.
Conclusion: Among all the girls, those who have slept with a man making over a million a year, either themselves or through friends, is as high as 50-60%.