"which theory of attraction suggests that long-term relationships are likely to continue when both partners are committed and put a lot into the relationship and when there are few attractive tempting alternatives around? "

answer; for good luck

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.