1. lack of desire
2. hormonal fluctuations
4. physically exhausted
5. no reason
However, they encourage women to move past these things and begin by seeking the Lord.
Make sex a priority, rearranging whatever is necessary in life until you have given it the proper place; remember, it’s a priority in God’s eyes and an entire book of the Bible is devoted to it! (Heb. 13:4)
The entire article is well worth the read.
from Reforming the Feminine