What does seafood have to do with ?

I was watching a movie TV the other day and I heard a woman say "I just had a a lot of seafood you know what that means don't you" and then she was having with a guy and then I heard another woman(about a month later) on a different movie say "I consumed a whole bucket of Oysters especially for this occasion right before she had with guy" what exactly is seafood's part in ?