新聞記事やプールの画像あり（英語）
https://www.wbez.org/shows/curious-city/baring-it-all-why-boys-swam-naked-in-chicago-high-schools/c9a3a9e2-6ae3-404b-80e5-0c4bf4d5a0be
https://garygarthmccann.com/2014/04/18/mens-swimwear-for-summer-2014/

https://qph.fs.quoracdn.net/main-qimg-aaaf842aeb477ca3c93a335e06abff66
https://qph.fs.quoracdn.net/main-qimg-f7e45eb413a37e06e6f54173b3eec155
https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcS_owCnYZ1yAOUBDRHeli4CR7bHuAibc-SL5E1m4ufZ6llaCOmrJw&;amp;s