yea a pic is really needed, but bananas sounds like possible hermie, especially if it was from fem is, usually if theres an issue with a fem seed its that it is or turns hermie
no IMO i dont see any male parts(balls etc) but at the same time i dont see any signs of female, may jus be my shit eyes, but id say its not showing sex yet as its too early, how old is the plant? is it in flowering?
he probably saw the stipules (i believe thats what theyre called) and thought they were male preflowers.