I've never had a request for or even had this discussion with any of the women that I have been with about wanting to be choked. I can understand the increased arousal that might occur for some women, however fear in others.
I was on the receiving end of being choked, unintentionally.
It was while an ex lay on top of me, thrusting her hips while I was fully inside her. The top of her shoulder began moving tighter and tighter under my neck, she pulled her body closer to mine, eventually grabbing the headboard that was located in front of her. She slightly pushed her shoulder further into my neck, not forcefully moving back and forth but just pressing tighter and tighter. I felt as though she was going to cum, and I did not want to interupt her with a comment that would break the intensity. Of course if it was too much or I was completely restricted from breathing I would have motioned for her to stop.
She climaxed shortly after, releasing the pressure. While I did feel a heightened sensation, it is something that I did not forget. Having her body press that hard upon me, and the intense orgasm that followed was worth the temporary discomfort.