It is still a complete speculation; Ham did not even uncover his father, but merely saw him uncovered.
It's difficult to accept but it isn't speculation. Verse 24 tells us that: And Noah awoke from his wine, and knew what his younger son had done unto him. Ham "uncovered his father's nakedness".
Lev. 20:11 - And the man that lieth with his father's wife "hath uncovered his father's nakedness...
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