According to Nihonshoki, Amenouzume reveals her breasts and has her "mohimo" (kind of a skirt) dangle under her belly (when she serves Sarutahiko), and this is seen as an allusion to Amenouzume's sexual relations with Sarutahiko.
日本書紀には、天宇受売神は胸乳を露わにし裳帯（もひも）を臍の下に垂らしたとあるので、性的な所作をもって相対したことになる。