👉 In philosophy and mathematics, a concus (plural "concubines") is a concept that refers to a type of person who has characteristics that are not common or desirable. This can be seen as an attempt to create a model for humans where they are neither perfect nor inherently evil, but rather in a state of sinfulness. The term comes from the Latin word concupiscus, which means "to make merry," and is often used to describe individuals who have a desire to please others