Freaking Facts About Your Breasts

Women Are Buying Bigger Bras

The average woman says she now wears a 34DD-sized bra, according to data from lingerie retailer Intimacy. That's up from a 34B 20 years ago! (To put that into perspective, that's the same band measurement, but about three inches bigger around the fullest part of the chest.)

About 85 percent of women are, according to Intimacy data.

Most Women Aren't Happy with Their Breasts

Seventy percent are down on their girls, according to research published in theInternational Journal of Sexual Health. 

Breast Action Turns You On

Eighty-two percent of women say boob-play gets them aroused (or more aroused than when the girls don't get any action), according to a 2006 study.

It's Normal for Them to Hurt While Exercising

In fact, almost one in three marathon runners experiences breast pain, according to a recent study out of the United Kingdom.

So get this: When you run, the twins do, too—in a sort of figure-eight shape. And they can travel up to eight inches, according to research out of the U.K.

The Twins Aren’t Always Identical

In fact, one breast is usually about a fifth of a cup size larger than the other, on average, according to the bookBreasts: A Natural and Unnatural History by Florence Williams.

Breast Augmentation Is (Still) in High Demand

It was the top cosmetic surgical procedure in 2012, according to the American Society of Plastic Surgeons. About 286,000 patients had their breasts done last year—although that's down seven percent from 2011.