What was the sexual orientation of Shaka Zulu?

I'm sure there are comments made about him being gay or bisexual but how is anyone to really know..there will always be rumors about any iconic figure that people only know certain things about so to out right say he was gay would be false because it can't be proven. People tend to forget that in Zulu history homosexuality was not practiced so it is not possible to comment with certainty that King Shaka was homosexual but facts indicate that his most favoured wife tried to warn about his half brother assassin Dingane.