TMI ** please just reply

my boyfriend and I had sex and well I know this is really tmi but his penis will smell really gross, fishy like. and I'll tell him to go wash it and he will! but when I go down on him it still has that smell so I stop myself and we'd just have intercourse but this past time i noticed my vagina having that same stench whenever I drop my pants to use the restroom coming from my underwear. i go into the shower and wash my parts but it still is there. what could it be? no discharge its literally just my vaginal area....