Pregnancy fetishism (also known as maiesiophilia or maieusophoria) is a term used to describe the contexts in which pregnancy is seen by individuals and cultures as an erotic phenomenon. It may include the sexual attraction for women who are pregnant or appear pregnant, the attraction to lactation, or an attraction for the stages of pregnancy such as impregnation or giving birth.

There are no particular or preferred elements within maiesiophilia that are common to all maiesiophiliacs. Some may pursue fantasies that are concerned with the circumstances in which a subject may give birth, or to the conditions to which the pregnant subject may find themselves acting upon, such as approaches to mobility, sleeping, and dressing. Particular areas and processes of the body that change during pregnancy may also become the focus of psychological investment, but nudity or sexual activity is not always essential, and in some cases actual pregnancy is not necessary to invoke arousal. In these cases, the appearance of an enlarged abdomen caused by obesity or overeating may be sufficient, or simply the suggestion of a protruding navel