1. Nippon no Sex 2018 Banhttps://www.sagami-gomu.co.jp/project/nipponnosex2018/01_love_sex.html
2. “Wakamono No Sei” Hakusho: Dai 8 Kai Seisyounen No Seikoudou Zenkokucyousa Houkoku,2019
3. Labo. LGBT Chousahttps://www.dentsu.co.jp/news/release/2015/0423-004032.html.
4. Nippon no Sexhttps://www.sagami-gomu.co.jp/project/nipponnosex/
5. Ministry of Health, Labour and Welfarehttps://www.mhlw.go.jp/topics/2005/04/tp0411-1.html