I am a man and it wasn't until after I had my first intimate relationship with a woman, that I asked her what those extendable metal things at the end of an exam table are for.
She told me they are called "stirrups" and are used to hold her legs apart for when a doctor wants to insert a vaginal dilating instrument into her in order to get a sample from inside her to test for diseases in that area of the reproductive system. After hearing and eventually seeing stirrups actually being used for a Pap smear exam, I was hooked on how sexy a woman can look with her feet in stirrups.
Since then, I have given pleasure to a woman with her feet in stirrups and a couple of other times with her knees supported by knee stirrups. I have also designed and built my own exam table and I am currently preparing some stirrups I bought from eBay to be used with a bed or massage table.