Women are now getting more elaborate tattoos than before with great results as these pictures will show. You don't lose your femininity by have large tattoos. If done properly and with a good tattoo artist, a large tattoo will be an enhancement and not a detriment.
When thinking about going for a large tattoo, be sure and work closely with your tattoo artist in making sure that the design will fit your contours and is designed specifically for you.
Back tattoos are a good way to have a large tattoo design that can flow with your contours well. You can have one large design or have a "theme" design made up of smaller tattoos that can be worked on over a longer period of time if you can't afford the one large tattoo.