I think must spend btc to girls
And not to buy btc miners
From my experience girls don't care much about, so I would rather spend it on miners, make bank, trade it for USD then get the girls. (well just the one girl for me who I already found, so I guess just take her out for a nice night.)
And thats why we are the smart men who will be the recipients to the largest wealth transfer in the history of mankind. Then we get as many girls as we want. =D