After my boyfriend and i had sex, he ate me out. When he finished and came up to kiss me he had such a horrible taste in his mouth and all over his lips. It smelled like sweaty armpits and garbage and fish and just ugh. Obviously the first thing i thought was that it was from me. What could have caused that odor? He also caught a cold sore the next day. It looked bad. As if there were about 3 on his lip at the same time. I didnt want to stare though. We didnt discuss this afterwards either.