This happened a couple of months ago at my girlfriends house (she lives in a bungalow so all of the rooms are on the same floor).
I'd gone over on the Friday evening after work and it was now about 10am Saturday morning, so I decided that I'd have a quick shower and then head home for a while. Nothing very unusual.
When I'd finished showering, I discovered there were no towels in the bathroom. Again not too surprising as she'd been doing a load of washing the day before and I'd seen them folded up in the kitchen, obviously they'd not been brought through.
So, I walked out of the bathroom, along the corridor and into the kitchen. I saw my girlfriend sitting at the end of the table drinking a coffee and walked in saying I needed a towel. It was then I noticed she wasn't alone!
Also sitting at the table, but behind the door, was one of her friends - who happens to be married to a good friend of mine [that's how I'd met my girlfriend]. I dropped my arms and tried to cover myself up, turning round and starting to walk out of the room at the same time.
My girlfriend called me back saying that I was being a really mean tease: "You can't go around flashing yourself off to women and then trying to run away". She told me come back into the room and put my arms by my sides, adding that she'd already told Sarah all about me in intimate detail so it's only fair she can check for herself. I tried to object, but with a little helping hand from my girlfriend, was soon standing there naked, arms at my sides.
She then started touching and examining me and discussing everything with Sarah, but then suddenly stopped. She told Sarah to carry on by herself and left the room, returning moments later with shaving foam and a razor. This is when I started to think this was all planned, as I'm normally smooth but my girlfriend had pursuaded me to not shave for over a week.
She told Sarah that they'd need to shave me to be able to see everything properly. A towel was spread out on the table and I was told to lay down on it, legs apart and knees slightly bent. My girlfriend then proceeded to shave me, with Sarah helping by holding the necessary bits out of the way! Fully shaved, I was wiped down and left lying on the table.
The next hour or so was spent with the pair of them touching, examining and measuring every intimate part of me - commenting on every minute detail as they went. My girlfriend had never even measured, let alone performed a full medical examination on me, until now, so it was a real shock especially with her friend also taking part.
Finally they were finished and I left them chatting as I went back to have another shower and get cleaned up . When I came back out, still naked, Sarah had gone and my girlfriend was sitting grinning. I've no idea if they've discussed this with other friends, or if Sarah told her husband - one day I'll probably find out. What's odd is my girlfriend has no idea that I've been a patient in play exams in the past, so this was a total surprise.
I found that the initial excitement was the totally unexpected exposure to Sarah, but that was soon over shaddowed by the shaving and full examination by the pair of them. It is the increasing stages of the humiliation which I find so incredible and this just got better with the measuring and finally ejaculating, all in front of her friend.