A pillow princess usually refers to a woman who loves to receive pleasure, particularly oral sex, but does not make an effort to reciprocate. The term is most often used in the LGBTQ community to refer to gay women.
The term pillow princess is believed to have emerged in the 1990s in lesbian publications where "pillow" referred to someone being passive and "princess" denoted a person who expected special treatment or favors. The term expanded to refer to heterosexual couplings around 2010.