But before you jump on the bandwagon of deodorant sticks, sprays and stones, you should know that these types of products, while safe for the armpits, are not meant to be used on the genitals. They may contain chemicals that can irritate Australia's most delicate skin. If you're sweating in your groin area and you really want to use a deodorant, it may be safe to use a solid, unscented deodorant. Some deodorants marketed as “natural” ingredients, such as baking soda, activated charcoal and tea tree oil, for their antimicrobial and deodorizing properties.
Assuming you're referring to using deodorant for its odor-fighting properties instead of looking for a perverse way to apply it (or remove it, as the case may be), there are better and safer ways to freshen up odors that come from the crotch area. Deodorants marketed for use on genital areas are especially problematic because, while armpit deodorants are sold to everyone, most products intended for private parts are largely aimed at women. Finally, if you smell good and were interested in using deodorant on your penis anyway, there are spray fragrances and powders formulated for the whole body. If you're interested in using deodorant anywhere on your body besides your armpits, there are all-body spray deodorants that make applying the product to larger surfaces easier than a stick option.