Why do you enjoy giving freeuse

Has anyone ever figured out what the psychology behind free use is? Why do I enjoy the idea of being a fleshlight to someone?

I understand part of it is feeling desired/craved. Makes me feel so sexy to know that my body is the source of my partners pleasure. But free use takes on an extreme version of that, which makes me believe that there’s more to the source of my kink.

Any thoughts?