ZIPLOCk BAGS - male, because they hold everything in, but you can always see right through them. 
 
SHOE - male, because it is usually unpolished, with its tongue hanging out. 
 
COPIER - female, because once turned off, it takes a while to warm up. 
 
TIRE - male, because it goes bald and often is 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, squeezable and retain water. 
 
SUBWAY - male, because it uses the same old lines to pick people up. 
 
HOURGLASS - female, because over time, the weight shifts to the bottom. 
 
HAMMER - male, because it hasn't evolved much over the last 5,000 years, but it's handy to have around. 
 
REMOTE CONTROL - female .. Ha! You thought I'd say male. But consider this: it gives men pleasure, he'd be lost without it, and while he doesn't always know the right buttons to push, he keeps  trying.