Well, like many other Neo Pagans, I regard the Deities as male and female, simply because in general all life needs a male and female (yes, yes, I know there are exceptions).
Personally I see the Earth as the female, 'Mother', as we are made of the same stuff as her.
I see the Sun as the male, 'Father' because without him, all life on the planet would die (ok, maybe not the life around black smokers or those things that evolved in a romanian cave).
I don't actually think of these heavenly bodies as Deities, though - an animanistic terms, I think the spirits of these heavenly bodies can be regarded as Deities, though on a local, not Universal scale.
I choose to anthropomorphise these spirits as the Green man and Green Lady, it helps me to focus and visualise.
It doesn't suit me to think of any more than two 'Gods' but as spirituality is a personal thing, everyone is free to percieve the existence or non existence of a Deity in whatever form they wish.
I love the Hindu Pantheon which has multiple facets of the one Godhead, but when it comes to believing in them, thats another story......