It is true that the population needs to be controlled as it is expanding exponentially. There are two ways to firmly control the population which is by either breaking the constitution called marriage or control the tool or woman that is used to populate. In modern civilization, both have been tried but the second one got the most success. At first, to avoid arranged marriages which has a great success in creating an army of humans, the aspect of marrying a known individual has been portrayed as a better option. So, the young women found it more logical as it