When a person has left a controlling partner, they must work to repair the damaged relationships with friends and family. It can take a great deal of time before they are ready to trust these people again. This person must also learn to socialize normally, and they must begin dating eventually if they want a good relationship. This is not easy for them, and attempting to socialize might take them some time.
One of the things their bad relationship provided was an intimate partner. Even though that relationship is over, physical needs are still present. Trust is still an issue for a person that was isolated and controlled, so this person might find it difficult to fulfill these needs within a new relationship. They must find someone they can trust, but that doesn't require a relationship. A fuck buddy will take care of their physical needs while avoiding relationship issues.
Finding a person for no strings attached sex can be relatively easy in the modern world. There are online sites that provide profiles for fuck buddies. These people want to be with someone for a physical partnership only. They are not interested in a commitment, and will leave rather than get involved. Taking care of their physical needs is their only concern. They are willing to extend this to a partner, but both people remain emotionally free.
Keeping physical needs fulfilled is a good way to concentrate on other issues in life. It gives people a chance to take a fresh look at what they need, and they can feel free to pursue their goals. They do not feel tied down to one person. This allows them the opportunity to really get to know people, and it helps take the pressure off being in a relationship. They can take all the time they need before trusting another partner and making a commitment.