For example:

Ziploc bags are Male. They are male because they hold everything in,
but you can see right through them.

Copiers are Female. They are female because once turned off, it takes
a while to warm them up again. It's an effective reproductive device
if the right buttons are pushed, but can wreak havoc if the wrong
buttons are pushed.

Tires are Male because they go bald and are often over-inflated.

Hot Air Balloons are Male because to get them to go anywhere, you have to light a fire under them, and of course, there's the hot air part.

Sponges are Female because they're soft, squeezable and retain water.

The Web Page is Female because it's always getting hit on.

The Subway is Male because it uses the same old lines to pick people
up.

The Hourglass is Female because over time, the weight shifts to the
bottom.

A Hammer is Male because it hasn't changed much over the last 5000
years, but it's handy to have around.

The Remote Control is Female. Yes,  you thought it would be male. But
consider this -- it gives a man pleasure, he'd be lost without it, and
while he doesn't always know the right buttons to push, he keeps
trying.