 Females may have a strong, uncontrollable appetite, which males may use to their advantage by manipulating females through edible gifts.Males of several species of "Heliconius" butterflies, such as "Heliconius melpomene" and "Heliconius erato", have been found to transfer an antiaphrodisiac to the female during copulation.This compound is only produced in the male and is how males identify one another as male.