The same idea as "head to head" or "face to face" but involving the boobs of two different people. Could describe the physical act of touching breasts together or could be an idiomatic expression for an intense face-off of sorts.

Breasts is another way of saying boobs. Boobs refer to a woman's breasts.

They secrete milk after pregnancy, and are very sexually attractive to men. Men find women's boobs attractive for biological and evolutionary reasons, they signal to men that the woman attached to them is nutritionally healthy, youthful, and able to have a baby. So, boobs may be one of the main factors of sexual attraction between men and women that leads to reproduction and the continued survival of humans.

Playing with their boobs during sex can be arousing for women.

Because of their attractiveness, boobs are often times used by women to get men's attention, or to get them to do something. Men have been known to go to extreme lengths just for a woman's boobs.

1) The softest, tastiest, most tender cut of chicken.
2) The softest, tastiest, most tender part on a woman.
3) Where milk comes from.

the greatest creation known to man

What lonely teenaged boys wish they could touch.

The best pillows you can sleep on!

On a female, a mystical body part, it is common belief that if a man were to look at any other spot on a woman's body he would turn to stone.