I'm not into body piercing, except for one pair of earrings that I have, but if people want them, and they are done in a place that can be kept clean and well cared for, that is OK by me.
Areas of the body to be avoided for medical reasons are those that have a combination of wet and dry sides. A tongue has two wet sides, an earring or nipple ring has two dry sides. A deep lip piercing has a wet intra-oral side and a dry facial side. These types of piercings are MUCH more prone to infection than dry-dry or wet-wet piercings because the normally present bacterial floras are different on the two sides of the pierce, and it is difficult for a healthy environment to be maintained in those areas.
Be leary about intra-oral piercings. Many of them cause damage to teeth and also cause gum recession due to the trauma they inflict.
Penile piercings that go through the head of the penis don't usually present much of a problem, but others that have rods that extend into the penile urethra and are held in place by the Prince Albert (I forget what the rod is called) are more prone to problems, just like indwelling catheters.
Anyway, if you like them, fine, I personally don't, but what the female physician said to her male patient about his PA, and the lecture to him and the nurse, was uncalled for.