Thanks for providing that example. Don Juan in your example is one male. He may be less than 1 % of all of the males in the sample. So, your example has less than 1% of males having sex. While the percentage of females having sex will be much higher because he is having sex with many women.

Don Juan may be very busy, but his value stays at one. The measurement is whether a person had sex or not. Don Juan can't be counted more than once as a person that had sex.