About the feeling of being used.
It happens that the feeling of being used occurs when a person wanted to use a partner or a situation, but could not.
For example, a woman who consents to sex, not out of a clear sexual desire but in the hope of a relationship, may feel used if she is not offered that relationship.
Whereas a woman who consented to sex out of a clear sexual desire may feel satisfied, unsatisfied, angry, tired, embarrassed, sad, but in no way used. Because her actions coincided with her goals. They may have been slightly more or slightly less successful, but they coincided.
During use and manipulation, the actions do not coincide with the goals. And then only chance will tell who will succeed in reaching that hidden goal and who will not.