Coupling is more than simply male part A and female part B.
These analogies have troubled me for a few reasons.
David Broer LeRoux

Thank you for your thoughtful response. Since we seem to be on pretty much the same page, I’d like to take this opportunity to respectfully caution you against using language like this (i.e. the line quoted above — “male part A and female part B”). I’ve tried my best to stay away from heteronormative language in my writing, and I’d encourage you do to the same, because it erases millions of people in a huge sweep, and these conversations are important for all kinds of sex. (Just so you’re aware David Broer LeRoux, this type of casual heteronormativity has bothered me in many of this responses on this post, and yours just happens to be the one where I point this out.)

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