Getting a hard on isnt all about being turned on.
Explain the morning hard on?
No turn on there, its just that you want a piss.
True, morning wood isn't always sexual. They have done studies that prove guys can get hard out of fear too. I.e. guys getting rapped in prison get hard and even cum. But, being that those two cases aren't the same as stripping in a room full of guys grabbing and sucking on Kai's dick. They don't apply.

A straight man wouldn't think about a guy blowing them let alone let a man suck their dick.
But seriously, who cares if Kai is gay? Gays are just normal people too. And a "sport" were guys wear only thongs and excessive oil and prance around on stage for other men, shouldn't be so homophobic.