WTF is 'Hetero-Flexible'?

In grammar school, we learned about the figures of speech, and that a noun is a person, place or thing. But who would think that sexuality would eventually catch up to that 'other' level as well?

In the still-being-produced documentary titled 'Silence 2: Black Male Sexuality' a man explains a phenomenom going on in Brazil where an otherwise straight person can wade in and out of sexual orientations. He calls it 'heteroflexible.'

No word yet on if this is just the typical 'down low' rationale, because there's no way of knowing if the man is telling his sexual partners about his ever-changing status. Or if he changes his stylish clothes just as frequently. 

But then again, that would be metro-flexible, right?