The lesson of David Bowie was that, here was a guy that questioned all of the conventions in the 60s and 70s, and tried all of the alternative lifestyles, and what did he conclude?
That the conventional ways were best, as evidenced by the fact that he spent the last 20+ years of his life as a devoted husband and family man.
Good point.
As discussed, a lot of his gay experiences/bisexuality are rumour, myth and some put out by him. To enhance the androgynous myth.