Answer :
Final answer:
The first factor that has contributed to the steady rise of premarital sex since WWI is changing societal norms and values.
Explanation:
The first factor that has contributed to the steady rise of premarital sex since WWI is changing societal norms and values. In traditional societies, people generally waited until they were married to have sex and did not openly discuss it. However, in more recent years, there has been a greater acceptance and openness towards premarital sex. This shift in societal norms and values has played a significant role in the rise of premarital sex.
