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if sex == 'men' or 'Men':
Is executed as this; the or 'Men' part is always True.
if (sex == 'men') or 'Men':
# becomes
if (sex == 'men') or True:
# becomes
if True:
You can write that a number of ways depening on you needs:
if sex == 'men' or sex == 'Men':
if sex in ('men', 'Men'):
if sex.lower() == 'men':