My current toilet has a sink besides it. Wet TP does equivalent. But in my new house, the sink is not within reaching distance. I am considering an add-on.
All hail the bidet. Even the European-style bidet is kind of an inconvenient waste because you're still supposed to use plenty of paper before moving onto it. In Asia you use toilet paper only to dry.
The Japanese one is nice but the one common across South East Asia is the best because it doubles as a bowl cleaner: No need for a toilet brush.
I've recently switched to the handheld ones because the seat attachments require you to shift your butt around to catch the stream. Friends seem to be more weirded out by this one though.
I was enlightened the first time I traveled to Japan, and an affordable ($50) add-on has been installed in our master bath ever since.