Buttage is the tendency to expose part of the buttocks, typically so that the cheeks are partially or fully exposed (JE9024B). The implication is that the subject is not bottomless, and possesses at least fio dental up the posterior rugae.
The controlling fashion line for buttage is almost always the legline, and only when it is very high. Buttage represents an opposite action on the cuotte from rugage, in which the waistline descends from the top.
The exposure code for buttage is A, and buttage presumes an exposure of legs, L.
The most mild form of buttage is cheeking, the accidental or casual exposure of the bottom of the buttocks (RP8812, JE8910A).
Cheeking can occur intermittently, as with fabric rolling up in the back of a maillot (AB8301) or a culotte sliding into posterior rugae (VB8425, FL8611, CI8908), as is prone to occur with a string bikini brief.
Cheeking may be a permanent fixture of a bikiniite's swimsuit bottom, as with a string (SM8808), v-kini (VB8413, VB8428, RP8809, SM8870), or high-leglined maillot that will never quite cover the full butt. Short shorts are another vehicle to showcase the lower part of the rear (VB8501, MP96H6).
Buttage All The Time
Buttage is always present in the halfback (VB8401, VB8421), and microkini (FL8602,JE8906), and whenever the bikiniite forces the culotte up into the into posterior rugae (RP8802, CI8909). The evolution of this vector of uncovering from the side of the hip is discussed in some detail at the v-kini page, and is an evolution that distinguishes the 1980s.
This bikini contest at Ft. Lauderdale from the late 1980s captures how the more agressive contestants bare much of the sides of their buttocks (FL8603, FL8605), and includes the flapped tanga, which graduates exposures dry and wet (FL8604, FL8607), if not with the wind.
Bikini contests are one of the recurring witness points in Bikini Science because they document leading styles and attitudes of the more exhibitionistic bikiniites. By the 2000s bikini contestants vie less with buttage as a distinguishing factor and tend to bare the entire butt.
In the 1990s, with the evolution of the rolldown and the adjustable, buttage becomes a much more explicit object of play, if only because the bikiniite gets to "dial in" her degree of exposure. The voyeur is well aware of the flexability the bikiniite affords herself, and judges accordingly.
But even these flexible styles are subject to the pressures of evolution. Total buttage occures with tanga and g-string, two species which provide no discretion for their wearer, and which becomes a battleground of legality at some locations during the early 1990s.