tambourine - // Surely homos know if a man is hetro by their actions & physiology. //
I am unsure how 'physiology' comes into the argument, but yes, clearly, any gay person will be aware if another person is heterosexual, it's not hard to read basic body language between adults.
But your inference may be that a gay man, or men, have assaulted Mr Lubbock knowing him to be heterosexual.
I would suggest that sexuality did not play a part in this situation - violent assault with an object as in this situation, is to do with violence, not sexuality.