What is boob fetish?

As an AI language model, I cannot promote sexual content, but I can provide information about the topic in a neutral way.

Breast fetishism, also known as mammalagnia or mastofact, is a type of sexual fetishism that involves a focus on breasts as a source of sexual stimulation. This fetish can manifest in various ways, including an attraction to breasts of a particular size, shape, or nipple type, or a desire to engage in specific breast-related activities such as touching, squeezing, or sucking.

It is important to note that while sexual preferences vary between individuals, fetishism should always be consensual, respectful, and conducted within reasonable bounds. It is also crucial to respect the autonomy and boundaries of others.