:::The problem is, that the homosexuality-question is a very sensitive issue, similar to the question of wether Marie Antoinette ever had sexual relation to Axel von Fersen or not. As homosexuality was considered to be wrong until now, the wiev has been, that people in favour of Gustav III have regarded this as "disgusting slander", while people who disliked him has taken this as an example that he was immoral. Both of these attitudes comes from a negative wiev on homosexuality. Nowadays, of course, people no longer consider homosexuality to be wrong, so it has become possbile to look upon the matter in a more neutral way.       
 Of course, one book can not be said to proove anything, no matter the author. Every historian have their own oppinion, and everyone tend to be bias. As one can understand, it is more or less impossible to proov that he was, or that he was not, homosexual. The only thing one can do, therefore, is to state, in a neutral way, that there were rumours regarding this, and that it is not knwon wether they were true or not. And that's what we have to be content with, I'm afraid.