Trust me, that is perfectly normal! The first few months of a relationship, when you are just falling in love, the so-called honeymoon period, are the most exciting, and you probably could't get enough of each other! But women do go through phases. A lot of it she has no control over because it is hormonal. There are times during her cycle that she will naturally want it more, and other times less or not at all.
Be sensitive to her feelings when she tells you she is not in the mood. If you get mad at her or make her feel bad or guilty about not being in the mood she is less likely to ever be! Maybe something else in her life is stressing her out. Nothing kills the mood for a woman like stress, fatigue, or negative feelings about her partner.
Try giving her a back-rub, or talking to her about her day so that if something has happened that has upset or stressed her out she has a chance to talk about it, and you will also be aware of it. And never ever try to pressure her into it if she says no.... Your understanding and respect will make a huge difference in the way she responds to you next time.
