Is this poem about ?

Images of fish and the sea are sometimes used to describe the smell of a woman's . That description can be a rude joke or a ist put-down, but it can also be used positively and lovingly. With that in mind, "All day the kitchen smells of sea" could be intended to suggest something like "All day the house smells of last night's lovemaking," and the lines about mouth, tongue, and the pastel colours of crab flesh could be meant to suggest . The lines "until you snatch them from me, as you snatch/yourself, gently, if I come too close" could be about a lover pulling away from unwanted contact with some off-limits body part. (Although it's possible that those lines refer to a pulling away that's emotional rather than physical.) So your teacher could be right, but it's not a sure thing.