Hence, urination can take place while sitting or squatting for defecation. There is also no difference for defecation or squatting urination. Constipation is a common cause of painful defecation. Anismus occurs in a small minority of persons with chronic constipation or obstructed defecation. Rectal mucosal prolapse can be a cause of obstructed defecation (outlet obstruction). It is also responsible for control of defecation and urination. This applies to defecation and urination by males and females. It holds the formed feces awaiting elimination via defecation. It was then euphemistically used for the similarly private rooms used for urination and defecation. Related to sexual slang is slang related to defecation and flatulence (toilet humor, scatolinguistics). Rectal tenesmus is a feeling of incomplete defecation. It also improves obstructed defecation symptoms. The free eggs and detached proglottids are spread through the host's defecation (peristalsis). The rectum needs to be of a sufficient volume to store stool until defecation. Another design is to have two buttons, one for urination and the other for defecation.