An experiment conducted by researchers involved adding a synthesized female pheromone to the perfume of one group of women (the experimental group), and a placebo was added to another group (the control group). The researchers found that the women who had pheromone-treated perfume had intercourse more frequently than the control group. However, the two groups did not differ in their frequency of masturbation. This indicates that:

the pheromone increased the women's attractiveness to men

Explanation:

A pheromone is a chemical that a both animals and humans produce in order to attract the opposite sex. Therefore based on this information and the results of the research study it can be concluded that the pheromone increased the women's attractiveness to men. Which is why the group that were given the pheromone had intercourse more often.

this is a pretty broad question and can be a pretty lengthy answer. since 1900, women have gained a lot more rights and have become active in the workforce. with women being in the workforce, men play a larger role in family life. many family tasks are shared between men and women, whereas, women used to be the sole family caretakers.

that should get you started at least.