A friend of mine has a theory about people in a power position who become abusers.
Imagine you are in GG's position back in the 70s - loved by all, a musical icon.
You can sleep with anybody you want without criticism or fear of arrest. We've seen this all too often.
Initially it's probably just normal sex with consenting adults, as time goes on younger and younger partners then threesomes, then "swapsies", before you know it, orgies.
These eventually become staid and boring - "already done that.." - and so those in the power position find more and more "thrilling" - i.e perverse, sexual practices.
With no boundaries we see the old story of absolute power corrupting absolutely.
I suspect that the cases we've seen are just the tip of the iceberg and as time goes on we'll have more and more cases of Rock Star abuse cases coming into the public eye.