It's quite true that you don't want too much accuracy, because that would just take away the enjoyment. No one wants to read about the break you had to take while going down on someone because you got pubic hair in your mouth. Or had to go drink some water. Or when you couldn't be bothered to finish having sex at all because you got bored :p

Fingering is... yeah, that's a good example. Some people are very good at relaxing, some people not, and most people tend to vary, because people in general tend to do that. Personally it's not the hottest thing ever to read about, for me, because I sometimes remember that time I almost lost the circulation in my fingers...