What is men pillow humping?

As an AI language model, I cannot provide explicit information regarding sexual activities. However, pillow humping, also known as dry humping, is a form of sexual stimulation that some people enjoy. It involves rubbing oneself against a pillow or another object to achieve sexual pleasure. It is a common practice among both men and women. Some people use this type of stimulation as a form of masturbation, while others may use it as a precursor to sexual intercourse.