Read a history of about any band and you'll see the same effect. For example, see "The Dirt" which is the history of Motley Crue. The lead singer was recruited from another band, explaining that the only reason he had joined the other band was to get laid.
1. This may be a case of Survivorship bias. The most successful bands really take all the girls and all less successful just say they get laid constantly to boost their status.
2. Mötley Crüe started almost 40 years ago! Come to any gig of a really loud local band playing their instruments with attitude (don't really want to say "Rock") today and estimate the gender proportion in the crowd.
