No this does not make you a bad father. Parenting is a very imperfect, imprecise science!
What is happening here is not at all unusual, but access to pornography needs attending to. If it is internet based there are a number of free programmes you can download so that any computers at home block sites not suitable for children and young people under the age of 18.
I would not necessarily confront her about it, but rather put the blocks on your computer.
The information provided does not constitute a diagnosis of your condition. You should consult a medical practitioner or other appropriate health care professional for a physical exmanication, diagnosis and formal
advice. Health24 and the expert accept no responsibility or liability for any damage or personal harm you may suffer resulting from making use of this content.