If this answer help!!
Actually Yaoi is anyhow (fiction) but many of the manga shows that cleaning is important before sex
For example-
1- SM Gokko : http://www.mangago.me/read-manga/sm_gokko/
2- Kawai Obaka kun- http://www.mangago.me/read-manga/kawaii_obaka_kun/
3- BL sakka Tokidoki -http://www.mangago.me/read-manga/bl_sakka_tokidoki_ookami/......
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