omg Julie, I have the EXACT same tingling feelings in the rear, and the same worry that it is a "sign." At first I didn't realize the tingling that would go in waves from the top to mid area of my butt down to the bottom of my butt were connected with bowel movements- but then it now happens regularly in connection with a bowel movement. I asked my boyfriend if he got any strange sensations ever when he has to go (he DOES have IBS-like problems), and he looked at me like I was crazy until he realized why I was asking. I don't think I have any problems like IBS, so the whole sensation thing does make me worry that it is a sign of current damage and a precurser to larger problems down the line.

Thanks for bring it up, I was about to do the same!