Shurewood mentioned Zak Spears. He's been around for a long time. He probably has a lot to say. ...
John Holmes written by someone who was actually there and had no agenda, just told the facts. That saw his fall into addiction and the extent of his involvement for the Wonderland Murders, ie. who were the co-conspritors, did he actually kill someone, how far gone was he by that point, etc.
... Another great book subject would be Bobby Garcia, who filmed hundreds and hundreds of straight Marines getting their first encounter with gay sex.
I'd go with Jeff Stryker also, be better if it were an audio book and Jeff were the narrator.
I think the book would have to be someone who has been in the industry for at least 15 years. Mark Davis (a straight porn star) has been in it for at least 20 years, and has---I'm pretty sure---struggled with alcoholism and drug addiction. He might have a good story to tell.
Has anyone seen the movie about that German (I think.) iconic guy with the bleached pageboy haircut from the '70s that used to be a perennial in the gay district of San Francisco? He would simply walk the streets in these extravagant sexually provocative outfits---mainly just to be seen, not so much to get laid. His vanity apparently was off the charts! I forget its name (something like "Who's that guy?"), but it really is fascinating on many levels.
That could be none other than, That Man: Peter Berlin! He's 73 now I believe.