seikan boudaibu 精管膨大部 Ampulla of ductus deferens.
'Cowper's gland.' 'Urine path ball gland.' ( :Etymology of Abdominal Visceral Terms) This is mostly the NSFW continuation of the full article about Body Parts. Let's start with the technical terms for sex-related anatomy. So, for reference, a list of sex-related Japanese vocabulary. A lot of manga and anime feature sex-related jokes, or dirty jokes, 'low jokes,' shimoneta 下ネタ, besides those that are simply sexual in nature, like of the ecchi and hentai genres.