I wonder if it's worth having a follow-up post, outlining how sex concerns the life history strategies associated with the production of big/small gametes, and this is what makes you M/F, rather than actual presence of gametes (since e.g. post menopausal women don't produce gametes, but are still female, and emphasising strategy makes sense of the intuition that even the vast majority (though not all) of 'intersex' people are still pretty clearly M or F).