The sexy in this bra was mostly the under wire cups which support the breasts, the pads or cookies that add to the bust size and the design that was made to push the breasts up, and out providing for "spill out cleavage". Since the WonderBra there have been many, too many to mention improvements in bra design and manufacturing. We will look at a narrow range of style of sexy bras. Most have not had the fanfare of the original wonder bra, but incorporate many of the same features as real advancements in bras have been mainly in the area of fabric, use of color and design elements regarding the look and feel of the garment. 

Shelf Bras: One of the main stays of the sexy bra market, the shelf bra is pretty much what it says. The breasts rest on a shelf composed of an under wire, and a mini cup that is similar to any bra with the top half to two thirds removed exposing the breasts from about the nipples up. While the bra offers some support, it is not suggested for large breasted women as it does not offer sufficient support. On the other hand, it allows the breasts to be exposed which is an essential element for a sexy bra. Worn under a blouse or sweater, the breasts appear larger, are supported and give the woman the cleavage she desires as it does the double duty of pushing the breasts together and upwards. Exposing the breasts is a common element of most sexy bras as showing cleavage is a major part of wearing a sexy bra.  

Push Up Bras: The term push up bra is used to describe a wide range of bras from under wire bras to padded bras. The push up in bras refers to the natural benefit of wearing a bra. Breasts, depending on their size will tend to sag, the larger they get. Bras support the breasts and the addition of under wires and pads add to the push up effect. Push up bras are distinguished from other bras as they tend to be designed and cut to expose the breasts in between the breasts to give a "sexier", more youthful, perky or firm look. Sexy could be synonymous with the terms "full figured, busty, perky, youthful, or many other terms when it comes to referring to a woman's appearance and her breasts. 

Peek-A-Boo Bras/ boob out bras: These bras make up a small but growing portion of the market. Many would ask what is the point of having a woman's nipples exposed while wearing a bra? Many women, if not most, are raised to believe that exposing ones nipples, or the effect of having hard nipples is to be hidden or disguised. The peek a boo bras are designed for those women or men who do not agree with this belief. These bras generally have under wires, and some padding, with the only difference being the lack of covering over the nipples. 

Sheer Bras: The sheer bra is a staple of the sexy bra market. Sheer fabric with a lycra spandex blend allows the bra to stretch and hug the breasts, while being see through and not covering or hiding the breasts, thus its sex appeal. Virtually every bra maker offers sheer bras, some adorned with embroidery, others not. The use of under wires allows the sheer bra to offer support, although not as much as fabrics that are stiffer and not quite as supple.

Water, Gel or Silicone Bras: These bras make it into the sexy bra category as they are examples of where the sexy bra industry has evolved. The addition of these bras with either water, gel or silicone inserts allow the wearer to have the appearance of larger breasts that look and feel like real breasts. As with all evolutions, there have and are problems. Water bras can leak, gel and silicone bras can get heavy to the wearer, and women were advised not to wear gel bras as airport authorities warned that they could be used by terrorists to carry explosives or other bomb making material.