A friend of mine was doing his third-year FP rotation. It was towards the end of it, and his preceptor was getting really backed-up in the clinic. The preceptor, a female, asked him to go into a room and start working-up a 14-year-old girl who'd come in with some complaint (can't remember what it was - not important here).
Apparently, the nurse had put her in the room and told her to get changed. When my buddy walked in, the girl was standing - not sitting - STANDING by the examination table... buck naked. Now, he assures me - only from a purely clinical standpoint - that this was a fully-developed and quite attractive young lady who'd apparently missed the instruction about putting on the gown. While it's refreshing that she was so comfortable with her body image (still being somewhat of girl at that point and despite the fact that she had "blossomed"), my friend was not.
He saw the girl standing there, turned completely beet red, started stammering, and just managed to get out an "excuse me" before turning and walking out of the room. Now, this guy had seen a naked woman (read that - 'woman') before, but just simply wasn't mentally prepared for this when he walked in the exam room. He was so embarrassed by the whole thing, that he eventually leaned back in the door and told the girl that she should put a gown on and he'd be right back in.
Weird stuff happens in medicine. Some of it's gross. Some of it's funny. Some of it's sad. I got woozy on my first ER case (years ago as a tech) when the attending asked me to assist her in packing and sewing up a scrotal abcess. It's okay to get woozy or embarassed once or twice, just so long as it doesn't happen every time.