When 3 lesbians get together and scissor and at least one of them has an STD/STI or at least a yeast infection Hence the "Cheese"
You hear about Carly, Alex, and Jenny? Those three had a Cheese and Mayo Sandwich. One of em has herpes and one of em has a yeast infection and Alix is a squirter
So called because, if unwashed, the region between the head of the penis and the uncircumcised skin could develop a sweaty, smelly residue - a bit like smelly cheese.
Paul was glad he wasn't a cheesemaker because he only washed once a week.