Most Helpful Girl
Every relationships are happy in the beginning but to some unfortunate ones, the relationship began to get sour in the middle. One of them is probably unsatisfied with something. For example, a couple used to have sexual intercourse all the time when suddenly, one of them lost their interest in it. The other person is of course very unhappy with the change. Due to their insatiable lust, they'd do anything as long as they get what they want.
Most Helpful Guy
Because most girls look for relationships and don't have sex with single dudes
So the only way to extract sex from them to prevent your blue balls from bursting in a legal manner is to pump them then dump them
(yes, it's morally wrong but then there's no other way as prostitution is now illegal)
Some guys would like to keep their girl and get some ass on the side whenever possible... saves them from having the trouble of finding another girl when he dumps the side chick after getting bored