Irritable bowel may give you a sore butt, but... that's the time to whip out the Preparation H. Actually, Prep H makes wipes for sufferers, too. Still, why not just take a shower daily? Or, learn how Asians use water to clean themselves après-poop? Personally, the thought of using wet-wipes in that region evokes images of slimy snails crawling around my anus. Not something I want to feel down there, thank you. Regular toilet paper, a daily shower, and good old Prep H as needed for me.
Oh, one final note for the penny-pinchers and those who can't install a bidet: use a good, old fashioned watering can. People will wonder why you have one in the toilet when you don't have plants there, but it is an option. I discovered this reasonable alternative after quizzing an Iranian friend about the watering can in his own toilet.