prey eyes is right. now tho the next question is why do human lips look red in the first place, and that is in white female humans, what are they in black women, a slightly darker shade just like their labia lips. So clearly what happened here is evolution, whatever random mutation in the past caused a human womans lips to be the same color as labia lips, due to more blood being in it, that got chosen for sexual selection and was beneficial so you can see why it survived in the gene stream. So both can be right, it is there for sexua lselection and human women will wear lipstick because it fades as they get older. Hot young girls often don't need much make up or none at all but they need it more as they age.