Strangely (!), this came up on my playlist last week and I happened to listen to some of the lyrics…is it about a young groupie lady? Not sure if this would be acceptable to some of our more modern types…
According to Wikipedia I think the nearest we can say is the lady in question slept around a lot. I assumed it was about a hooker, but it isn't clear any money was involved. Given they were on the music scene she might well have been a groupie. Recap: It's come back to me why I thought it was about a hooker. "I spent my money and I took my turn". But that seems like artistic license given the aforementioned article. Apparently it was originally called 'Prostitute'. That may have been a little vindictive. Young men, eh! Let's not get into Led Zeppelin in L.A.