show her the book! the more she knows and questions she is allowed to ask the better! it is better to set her straight early and give her the right facts and ideas about sex because other wise where will she learn? school friends are notoriously bad at getting their facts straight so you dont know wat misinformation and myths your daughter may hear and believe unless you set her straight about it yourself.
good luck!

I think I would ask myself why I have such a problem reading the book on your office desk. I often have found in my work that our children do come along with some gifts for us. They are able to re-awaken in us aspects of ourselves that we have lost. I am sure this is probably the case here. If you explore your own growing up time, was it especially repressed, did you lose sight of that ability to live right in the moment, and be out of control. If you think about it, creativity, making love, inspiration, come when we give up the control. Many world changing ideas, it is well known, float into people's minds during periods of reverie. Your daughter is awake to herself, to her wish to be intimate, that does not mean sex but love with affection, connection, closeness. There is also the sexual aspect which is perfectly normal and natural. The more you seek to control this the more it will be acted by her later on in less safe ways, or it will be acted out by someone else in your family. Your willingness to go into your own feelings around sex will give your daughter the best possible chance of retaining her natural innocence - innocence is a key to a happy and successful life. Please do email me if this seems to not make sense to you.

6 is way to young, you should just explain to her that she shouldnt talk about stuff like that because she's not old enough yet, oh and maybe you should remove the porn from your tv and not let her watch these shows, when a kid is really little they dont catch on to anything but at six they start trying to figure things out