[patricklynch]

Two things:

Which of these points do you take issue with, specifically?:

    [1]. Intelligent people are more likely to be homosexual.,
    [2]. Humans are evolutionarily designed to reproduce heterosexually., or
    [3]. The causal relationship, [2] --> [1]

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Are you really expecting a "mountain of evidence" in a blog post?

His main point, that intelligent people are more likely to seek novelty and deviate from evolutionary norms, seems plausible. And it's almost certainly addressed in greater detail by one of the many pointers to suggested reading.