Yo im starting to absolutely think if in the covers there is men and no women it mean yaoi...

Nope, here’s some proof:

http://www.mangago.zone/read-manga/mr_villain_s_day_off/

http://www.mangago.zone/read-manga/medical_return/

http://www.mangago.zone/read-manga/suicide_boy/?av=1

http://www.mangago.zone/read-manga/tanaka_kun_wa_itsumo_kedaruge/

http://www.mangago.zone/read-manga/nan_hao_shang_feng/

http://www.mangago.zone/read-manga/loplop/

http://www.mangago.zone/read-manga/coffin_jackson/

http://www.mangago.zone/read-manga/a_bout/

Oh yes thanks for the link, i know that not every cover with men is a yaoi story but can't help to disappointed for clicking to find that hot guy in the cover not a seme or uke