Rock stars rack up high numbers when they do tours 

Each town they are at the are girls from the show who want to go back to the trailer or hotel with them 

That means new women, several at a time, on each stop 

Jon Bon Jovi on the first tour talks about having all these girls back at the trailer "you first, you second, you third" 

David Lee Roth would have girls selected from the audience and taken back by his roadies

 VInce Neil at a Motley Crue concert would "fuck ten girls before the show and ten after" 

Tom Jones estimates he fucked 250 women a year during his "heyday" of touring and partying

 Keep in mind when these guys got experienced it would be orgy style - they would get hard, move from girl to girl and not cum until the end of the "event" 

when you consider planned orgies as well, these guys would be fucking maybe ten girls at each event - even one party a month you would fuck over 100 a year easily

 - a thousand in ten years 

- so when there is more than one party a month, or even a week, in different locations, you can see how 2000, 3000 in ten years, 6000 in 20 years, etc becomes achievable 

Gene Simmons famously claimed 6500 women, and that was when he was older and the band tours had stopped - which does sound possible 

The problem beyond a certain points is the repeats - end up with someone you have been with before but don't remember - which messes up the count

 If Rock stars do this on tour, it is likely wrestlers and other athletes, football, etc all do as well .