I had six students staring at me doing nothing when I had a forceps delivery. Wayyyy more intimate.
Then you should have been told why they were there and asked if you minded.
Let's not turn this into a 'medical humiliation' Top Trumps. No one should feel exposed, humiliated or like a steak on slab when they are undergoing a medical procedure. They should always have everything explained, asked for their permission for onlookers, reassured and made to feel as comfortable as possible. Random people wandering over for a gander without asking if you mind is not treating people with dignity.
The 'they;ve seen it all before, they've done 20 ops that day it all blends into one' argument actually reinforces the point that medics sometimes see people as 'just another 'colonoscopy' or whatever rather than seeing each person as a human being who may be scared, worried, embarrassed and who is in, for them, a very unfamiliar setting.
It may be your workplace, you may look at people genitals everyday, but most people are not overly familiar with operating rooms, and most people do not have people looking at their genitals everyday. It may be nothing to you, but it is often a scary first for them.
Saying ' I had ten doctors four nurses, a dog and his uncle up my foof' doesn't make any kind of point at all, are we supposed to cheer because you had an even lousier experience?
No one, man or woman, should come out of a medical procedure feeling as if they have been humiliated and badly treated, It is avoidable and unacceptable. It is almost always possible to make people feel respected and listened to.