This may sound strange, but it's absolutely true. I always wear a thong to medical exams, and three different female medical professionals, all of whom have asked me to wear gym shorts to my appointments, regularly pull down my gym shorts and my thong well below my waist to let them feel and inspect my pelvic area.
Here's how this happened. A bad bicycle wreck 15 years ago injured my right SI joint--the point where my right pelvic (hip) bone attaches to the right side of my sacrum, the lower five vertebrae, S1-S5, of my spine. Any kind of elastic band or tight belt that focuses pressure near my right pelvic (hip) bone now triggers nerve pain, (phantom pain.) It takes about an hour for it to start. If I can't remove my pants and underwear quickly, it gradually builds and spreads over the entire right side of my pelvis and down the back of my right thigh until it become unbearable. Normal men's underwear triggers this pain. A women's thong of the type with a wide and loose waist band well above the hips is much slower to trigger the nerve pain. If I wear any underwear at all now, it's always this kind of thong.
Twice a week I get physical therapy for my SI-joint pain. One of two young, attractive therapists, Stephanie or Kristi, works on me for half an hour before I do an hour of exercises and stretches. When I arrive, the receptionist sends me to a massage table, and Stephanie or Kristi soon comes over, says hello, and closes the curtains around our table for privacy. My first session was with Stephanie. When she saw I was wearing pants, she left and came back with some gym shorts. She asked me to remove my pants and put on the shorts. She left for a minute to let me change. When she returned Stephanie told me that I must wear gym shorts, not pants, to all my future appointments. She then put me on the table face down and I found out why. She pulled my shorts and thong (surprise!) well down my butt so she could give my sacrum a good massage. When Kristi works on me, she first sits on a stool next to the table and she asks me to stand close to her and face away. As soon as I do, I feel her pulling down my shorts and my thong well below my hips, and I feel her put her hands on the upper and outer corner of my butt. She feels for a certain part of my pelvic bones, and squeezes it enough to feel where she is and hold on to me there. Next she asks me to bend over over and straighten up two or three times, and she has me alternately raise my right and left knees as if marching in place while she continues to grip my right and left pelvic bones. This lets her know if my pelvic bones are aligned or not and how to work on me next. After she pulls my thong and shorts back up, she has me get on the table. Stephanie or Kristi both have me get on the table on my side at times, face up at times, and face down at times. They want my shorts and thong pulled down for a lot of things they do to me on the table. Sometimes they ask first to raise my hips off the table so they can pull down my shorts and thong enough to expose the part of my pelvis they need to work on. They need skin exposed so they can both feel and see how various parts of my pelvic area and lower back are moving in response to motions they ask me to perform and the motions they produce by pulling, pushing, twisting, and flexing my sacrum, left and right pelvic bones, and left and right legs in various ways and combinations with their left and right hands.
When these manipulations don't hurt, they can be very arousing. I love the one where Kristi has me face down on the table, (with partially bare butt up), and she pushes my butt hard into the table with both hands. She pushes right though my glutes to apply the pressure she needs to my right or left pelvic bone close to my sacrum, or to the sacrum itself. She sometimes drives my whole pelvis hard into the table with dozens of forceful, rhythmic thrusts. This doesn't hurt a bit. In fact, if she starts to do this a little longer or harder than she's doing it now, Kristi might discover a little mess on the table that needs to be cleaned up. I sometimes think she's trying to get me to that point on purpose because of that smile she has when she's done. I'm going to beg her not to stop one day.