When two female companions physically resemble the droids / robots R2-D2 and C3-PO from the Star Wars movies. An observed behavior wherein a female keeps the company of a perceived physically more or less attractive associate to alter the perception of their own allure.
Two women are together and one is tall and skinny the other short and portly. Potential male suitors usually have a friend entertain the R2-D2 of the pair so that he may have alone time with the C3-PO. Alone time with the C3-PO of the pair is a difficult thing as the females always travel together just like the droids that are their namesake.