SWISS ARMY KNIFE -- male, because even though it appears useful for a wide variety of work, it spends most of its time just opening bottles.
KIDNEYS -- female, because they always go to the bathroom in pairs.
TIRE -- male, because it goes bald and is often over-inflated.
HOT AIR BALLOON: male, because to get it to go anywhere, you have to light a fire under it . . . and, of course, there's the hot air part.
SPONGES -- female, because they are soft and squeezable and retain water.
WEB PAGE -- female, because it is always getting hit on.
SHOE -- male, because it is usually unpolished, with
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