Preventing Bathroom Steam
Open a window. The easiest way to ventilate a bathroom is to crack a window wide open. This will allow the air to circulate easily and will whisk the steam away. This isn't always possible though, because air that's too cold can make your shower uncomfortable in the winter.
Open the bathroom door. While it's always nice to have your privacy in the shower, excessive steam can be abated by leaving the bathroom door open. In combination with a window, this is an excellent way to ventilate a bathroom.
Turn on your bathroom ventilation system. Many new homes have built-in fan systems that will take care of the steam moisture for you. Just flip the ventilation fan switch on and you should be good to go. If you don't have a fan installed in your bathroom, consider hiring a contractor to install one.