butt plug
anal dilation
anal dilator
http://purl.bioontology.org/ontology/SNOMEDCT/337084005
https://en.wikipedia.org/wiki/Rectal_dilator
https://www.wikidata.org/wiki/Q18393736
A medical device similar to a speculum designed to open and relax the internal/external anal sphincter and rectum originally designed to facilitate medical inspection or relieve constipation.
anal dilators
rectal dilator
dilator