http://www.mangago.me/read-manga/koi_da_ai_da_wa_sateoite/
Didn't go all the way but they became sex friends.
Seme was straight.
http://www.mangago.me/read-manga/private_scandal/
Had drunk sex, other guy wants to forget about it lol.
Uke doesn't care about romance, seme was a callboy.
http://www.mangago.me/read-manga/bero_bero_yuru_yuru_tanoshii_sex/
Pure smut, threesome, one shot.
All of them are straight, wanted to experiment.
http://www.mangago.me/read-manga/yoidore_koi_o_sezu/
They drank but despite being buzzed, they're both aware and remember what happened.
Seme was straight, had ex-wife but open.
http://www.mangago.me/read-manga/oh_my_assistant/
Doesn't start with drunk sex but it happened. Frottage, no anal (seme thought he was straight but later admits he's bi)
http://www.mangago.me/read-manga/ore_to_joushi_no_kakushikoto/
Both drunk, includes video evidence lol.
Seme was straight.
http://www.mangago.me/read-manga/hashi_no_xl_saizu/
Getting drunk made them more open to having sex.
Both of them were straight.

Any yaoi manga where they got drunk and have sex .. it would be great if one or both of them are straight (▰˘◡˘▰)