Yes.
Some yes,some,no. There are uesful and not-so-useful in both sexes. It really depends on your definition of "useful".
No. Lemons contain Vitamin C and Thiamine, both which are good for the fertility of both men and women. Citric acid in the fruits however is bad for your teeth.
no
Scelerophobia.
No it is not.
Gilman argues that women's dependence on men for their livelihood results in a state of arrested intellectual and emotional development harmful to both genders.
older men
Both
Limestone is the rock that is most useful to modern industrial countries because it is the source for the main ingredient in cement.
Both men.
They're both men.
Same reason as women - bacteria in the urethra.