Caters to those who have sexual appeal to breasts, often of particular size (e.g. huge).
Alternate name: Mazophilia
The first video game about Breast fetishism was released on October 29, 2004.
This tag is only about the focus on breasts, not their size, so as long as breasts are focused on, their size does not matter (can be A cup or GG cup, doesn't matter).