Currently, the rapid development of information technology causes various positive impacts and negative impacts. All information (positive and negative contents) are available on the internet. They can easily accessible by various community members including students. Negative content or pornography contained in the internet can have adverse effects, affect the psychological and mental state, especially among students. The purpose of this research is to develop a system for identifying negative content based on the detection of the body's vital signs. The object of the body's vital signs is the nipple. The proposed method is a combination of face detection and face replace to reduce false positive error in the face area. Furthermore, Haar-Cascade Classifier training uses 1000 positive images data (nipple images) and 8000 negative images data (images that not contain of nipple). The feature extraction stage uses the Gray Level Co-occurrence Matrix (GLCM) 84 attribute and the result is continued YCbCr color space feature extraction process. The classification process use Multi Layer Perceptron with architecture of 10 neurons and 1 hidden layer. By using 158 data of nipple candidate objects, this research was able to detect nipple content with accuracy value of 90,3%, specificity value of 84,60%, and sensitivity value of 92,4%. This is shows that the addition of YCbCr color space feature extraction can increase the accuracy value of 0.9% and the sensitivity value of 1.04%.