How do you diaper your boyfriend?

Always assuming boyfriend wants to do this...

You can buy adult diapers at most drug stores and some larger supermarkets. They pull on like panties, and most have Velcro (TM) straps for adjusting the fit.

You can also use cloth diapers. You'll need a large square of fabric -- ordinary baby diapers are too small for an adult. I use an old trick I picked up from a movie. Think of the fabric as a Baseball diamond. Fold second base over to home plate. Dust boyfriend's bottom with baby powder and set him down halfway between the pitcher's mound and home plate. Bring first and third base together. Pull home plate and second base up to meet them and use a safety pin to hold the whole thing together.