Is it normal i have to wipe a certain number of times after using a toilet?

This is a little embarrassing. However, every time I use the toilet I must wipe my bum a certain number of times. Lately it's made up of 7 pairs totaling 73. For the first 3 pair it's 1-8 then 13-20. The last 4 are 13-20. I should also note this is when go number 1 it's different when I go number 2. It's not associated with how clean my bum is, so much as it is I just have to do it or something bad will happen. I've noticed it gets a thousand times worse if I have any caffeine or have been under stress. For instance, half way through the ritual I don't believe that I did the first half so I go back over and over again. Also, I'm a guy if that makes any difference...