Does preventing one's wife from biting visible areas during intercourse, due to embarrassment if they become visible to people, constitute a denial of her right to pleasure?

There is no blame upon you for preventing your wife from an action that causes her harm, and harm is removed due to the saying of the Messenger of Allah, peace and blessings be upon him: "There should be neither harming nor reciprocating harm." It is feared that this behavior might be a form of sadism.