Well, I finished the book the other day. I can highly recommend it. It's very well written and insightful into his psychology, motivations and inspirations. The bio ends soon after the success of "The Glass Menagerie." I think Kd5000 above must have been thinking of another Tennessee Williams bio, because this one was not tawdry or salacious at all. Yes, it discussed his sexuality but doesn't delve too deeply into his process of self-acceptance as gay. Nor, does it list or describe in any detail his sexual encounters, just that he did alot of cruising and was quite promiscuous for a while. In his diary he referd to sex as the "Nightingale". "The Nightingale sang sweetly last night". he's write.
He was raised in a very puritanical and repressive household and didn't loose his virginity until is late twenties. I think that's rather common for a person who is sexually repressed to um, "party hard" once they discover sex. The book was mostly about his creative life and his internal struggle with that and with the duality of being both "Tom" and "Tennessee".