You might not have known this, but a lot of non-living objects are actually either male or female.
Here are some examples:
They are male, because they hold everything in, but you can see right through them.
These are female, because once turned off, it takes a while to warm them up again.
They are an effective reproductive device if the right buttons are pushed, but can also wreak havoc if you push the wrong buttons.
Tires are male, because they go bald easily and are often over inflated.
HOT AIR BALLOONS:
Also a male object, because to get them to go anywhere, you have to light a fire under their arse.