Women who do this to men in order to get custody of children are the worst sickos imaginable as it puts down on EVERYONE's claim of this type of abuse.
I knew a woman who I felt was lying about her ex abusing their kids sexually. After MUCH psychotherapy for the kids, and an extremely intensive investigation taking years, the older child came forth and said that her mother told her to say these things if she wanted to continue living w/ her and then kept talking about it as if it really happened. The younger children were told the story so much that they would repeat it as truth. In time, it became very clear that there was NO sexual abuse and she was simply a loo loo. Think how damaging this was to her ex AND to her children.