There are several
definitions floating around out there - but this is an original scenario and should be considered an authentic Cactus Jack henceforth -
If lonely
in the desert, take a small cactus and carefully remove all needles. Insert a knife in the bottom and hollow out the pulp. You should now have a flap of cactus skin with a nicely
lubricated, aloey, gooey lining. Carefully insert two fingers and feel around the inside looking for any "ingrown needles". Once satisfied that your cactus meets all safety requirements, you may proceed to have sex with it. Afterwards, rinse and repeat as desired. The flap will fold easily and can be kept discreetly in your pocket.