I find this very hard to believe. Men have the exact same problem with stirrups. The addition of heels to riding boots was purely to keep the boot in the stirrup and had no relation to the sex of the rider. I bet that men wore stirrup heels long before women did.
You must also consider the definition of high heels. A stirrup heel doesn't need to be higher than about 15mm which is not considered to be a high heel. High heels are anything over about 40mm which is too high for horse riding.
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