Nope, here’s some proof:
http://www.mangago.me/read-manga/mr_villain_s_day_off/
http://www.mangago.me/read-manga/medical_return/
http://www.mangago.me/read-manga/suicide_boy/?av=1
http://www.mangago.me/read-manga/tanaka_kun_wa_itsumo_kedaruge/
http://www.mangago.me/read-manga/nan_hao_shang_feng/
http://www.mangago.me/read-manga/loplop/
http://www.mangago.me/read-manga/coffin_jackson/
http://www.mangago.me/read-manga/a_bout/
Yo im starting to absolutely think if in the covers there is men and no women it mean yaoi inside i need to check myself