re:
the testes, the left of which is lower in the vast majority of cases

Can you imagine the grant-proposal of the researcher who verified that factoid???


a taylor would be able to, i think. since mens trousers are cut and fitted in the crotch to accomate-- likewise, the testes tend to hang to one side or the other, especially in fitted clothes. a taylor might ask a gentleman if he dresses to the right? -- for no other reason than to fit the trousers.

and since even infants exhibit a tendence to have one testes lower, i expect it wasn't that hard to verify!