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.
Vaginal bacteria primarily inhabit the female reproductive tract and are not typically harmful to males. However, men can experience similar infections, such as bacterial vaginosis or sexually transmitted infections, which may cause symptoms like discharge or irritation. The symptoms can vary between genders, but men often exhibit fewer or milder symptoms compared to women. It's important for both men and women to seek medical advice if they suspect an infection.
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.
Same reason as women - bacteria in the urethra.
Both men.