I keep a clean-shaven body including pubic area (yes the shaft, balls everything) every two to three days depending on growth. Partly since I am very athletic I learned a long time both in the pool and on the bike having no hair makes it a lot more comfortable especially in bike pants, no pulled hairs etc. As for sex it also seems to excite some girls I go out with when they first see that I have no hair but as I tell them no unnecessary hair in the mouth either.
I do it in the shower with soap and I use a ladies shaver it just does a better job.