The above response made me think of an experience a friend told Michelle and I about that took place about 5 years ago.
His doctor ordered a testicular ultrasound. So, he shows up for the appointment 2 days later and is given a gown and told to strip from the waist down. He does so and an ultrasound tech and an assistant come in the room. He describes the tech as a plain jane, but in a pinch he'd do her. He describe the assistant as a hottie. He is instructed to put his feet up in stirrups, what I assume is what the ladies use at the obgyn. The gown is still covering him and the tech explains how the procedure will be done. She hands him a small towel and tells him to hold his penis out of the way. As he does that, she explains she is going to apply some gel to his scrotum and tells the assistant to watch how it's done. They pull his gown up over his knees. He immediately began to get hard.
BTW, Michelle and I are laughing our asses off over this storytelling.
A moment later, the tech is holding his right nut in one hand and gently rubbing the ultrasound 'reader' across it.
The assistants beeper goes off and the tech says that she can handle it from there. The assistant leaves. The tech continues on the right nut as she's staring intently at the screen. She says everything looks fine, then she presses the reader between his two nuts, separating them and is pushing it left and right and up and down. She looks over and sees how hard he is. She explains, nothing to be embarrassed about, it happens all the time.
So, the tech applies a little more gel to her gloved hand and rubs it into the surface, he says it was done a lot different then the right not because this time she's massaging the nut. He thinks she's trying to get him off.
A bit later she asks if he's okay.
He responds, "Yes, but not for much longer."
"We're almost done."
Then the reader touches the surface and she begins sliding it all around.
A few seconds of that and he tells her she needs to stop, as his sack begins tightening up.
She was staring at the screen and turns toward him. "Are you sure, there's nothing to be embarrassed about. It's not the first time this has happened and surely won't be the last."
He doesn't answer her. She took this as permission to continue and she begins rubbing the reader across both his nuts, not just the one she was examining. He said he just closed his eyes. About 40 seconds later he loaded the towel up.
She handed him a second towel and said, "I'll be back in a few minutes. Just clean yourself up and put the towels in that bin."
He said from the moment she started until she was done was about 3 minutes, that he's never cum so fast.
I'm laughing so hard at his telling of the story, that I'm almost crying. Michelle was laughing just as hard.
He goes on to explain that later that evening at his son's soccer game, he bumps into the ultrasound tech. She was there watching her nephew who was on the same team as his son.