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[–][deleted] 4 insightful - 1 fun4 insightful - 0 fun5 insightful - 1 fun -  (0 children)

It's probably a case of causal reductionism.

Assuming a single cause or reason when there were actually multiple causes or reasons.

The goal is to reduce something to a single cause that is easy to dismiss. In this case, "homosexuality is just about genitals". In reality is far more complicated.