It seems you're not aware of this, but in fact the law regarding indecent exposure actually varies greatly depending on wether you are male or female.
As unfair as it sounds, if a woman is naked in her house and a man notices from outside he can be arrested. However reverse the situation and it is the man (inside his own house) who can be arrested. This is because by law it is the mans responsibility to cover himself up. Yes men can be naked in their own home. Just not near windows, unless the curtains are drawn.
This is UK law.