it's just that mine seems crazy and perverse enough to be the product of cultural adaptation/rationalization while yours is more logical.
In other words, "I prefer mine because it makes a better strawman".
BTW, see here for a good description of the actual catholic position.
Strawman or not, TimS' version is still very problematic to a modern view of gender, as he says.
And more importantly, why do you believe that most people - especially in a traditional society - even care to apply logic and reflection when thinking about sex? So many other popular beliefs (on drugs, religion, etc) both then and now are full of cached thoughts, inherited memes etc. and lack rigorous reflection!
Here's the new thread for posting quotes, with the usual rules: