They also tell you that you're ok not washing your shorts for a week+ at a time...

"Stage 2: Folliculitis
This looks like acne -- small red bumps with puss-filled heads. These are found in hair follicles, and there's often a hair sprouting right out of the puss-filled bump. If this sounds like something you'd like to prevent, just ride with freshly-laundered cycling shorts each day, and/or use lots of Vaseline. Topical antibiotic gel or oral antibiotics may help, too.

Note: If you start your rides with a clean crotch and a clean, Vaseline-covered chamois, and you reapply Vaseline daily, you can go a week or two without laundering your shorts. That's how good Vaseline is."