This question is pretty personal, but it's not a bad idea to check them out if you suspect something might be wrong. However, you don't always need to 'examine' them to know that something is not quite right, lol.
Well, I observe them after going to the toilet as they lie in the toilet bowl before flushing. I also look on the toilet paper for any blood. Once a year, I send off a stool sample in a Bowel Cancer kit to a lab, just to be sure. Prevention is better than cure !!! If I do get it, at least it will be in the early stages then, and most likely treatable.
I wish I could say no . . . but my mother the nurse was bowel obsessed and I do tend to take a peek. Of course, I have no idea what I'm looking for but maybe if you look regularly you would notice a difference and get it checked . . . .