Why are socials rule needed??

Social norms are the accepted standards of behavior of social groups. ... Human beings need norms to guide and direct their behavior, to provide order and predictability in social relationships and to make sense of and understanding of each other's actions.

Explanation:

if im not mistaken its a. collective emotional arousal

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.