Learning how to enjoy other people's passions is not always easy. If someone is dating a person, they want to do things with them. If the two are basically incompatible when it comes to an activity, the day can become very frustrating for both of them. When one partner likes to spend the day shopping for vintage clothing, it might not be best for their partner to accompany them. This is a very specific hobby that should only be enjoyed with someone who shares it. By the end of the day, the shopper will be aggravated and the partner will be at their wit's end.
Couples often begin their relationship by testing each other with these types of dates. It is an endurance test at best. At worst, it leaves a person tense and frustrated by trying to pretend interest or patience. This is the time to seek some relaxation with a fuck buddy. There is no pretending in this type of relationship. There is one goal only, and that is physical relief. Both people are interested only in relieving their tension.
It may seem that this type of arrangement should not exist in modern society. Nothing could be further from the truth. Stress and tension is at an all time high in today's world. Fuck buddies are there to help relieve the tension and reduce some of the day to day stress. They are an anodyne to the serious cares of the world and make it easier to function.
Not all people are cut out to have casual sex. Many prefer to wait and be sure they have a relationship that works for them. They would rather find the perfect partner first and then make a commitment to be physically intimate. Having a go-to person makes the waiting easier for some people.