I can answer your question: yes, they do. You don't have to look for illegal content, you can:
1. Look for "fantasy stories" published by "child lovers". You'll find plenty that involve female adults with male or female children, indicating a - for lack of a better term - demand for that market.
2. Google "woman charged for creating child porn". You'll find at least a few cases of women who molested young children (preteens) and distributed the resulting material.
You can also look up cases like Karla Homolka, an infamous Canadian woman who was charged and sentenced for helping her husband rape and murder several young girls, including her own sister.
The depravity of the human mind is certainly not limited to the male sex.