The Breasts
In females the breasts are secondary sexual organs. Besides being milk-producing organs (during early child-rearing period), they are a centre of sexually sensitive nerves, and hence have a definite role in love-making.

The breasts are examples of organs which in the beginning are present in both the sexes. In the case of males they remain undeveloped, but in females they develop from puberty onwards. The breasts also exemplify the fact that in a man the sexually sensitive nerves are concentrated mainly in the penis-area, whereas in a woman such nerves are spread about in many parts of her body.

When sexually stimulated, the nipples of the breasts swell and become hardened. This takes place because of the flooding of blood into the nipples (just as the erection of the penis takes place with the flooding of blood into it).