Pubage is the exposure of the pubic region, including excessive bellage below the navel and the region of the pubis inside the inguinal lines. It is different than hairage in that it involves the display of the pubis, and it is different that crotage in that the latter defines an exposure in which the legs are opened but the pubis is covered. Unshaven subjects will tend to display hairage before pubage.
Two fashion lines govern vectors of revelation, one is the waistline descending from the navel and the other is the legline encroaching inside the inguinal lines. The former of these imply bellage. Pubage can also be created by crotchless creations, and is occasionally observed in skirted subjects who fail to wear panties and who fail to sit properly.
The exposure code for pubage is P, and this often implies a subject who is bottomless.
Pubage is rare in Bikini Science although if the region is completely depilated it does occasionally enter into play. Pubage is an exposure when a culotte lies inside the inguinal, and is occasionally seen on the real beach (FL8623, Vero8701). An adjustable narrowed to the extreme also invites pubage (RD8734). Like cleavage, pubage is a relative thing.
Pubage is also driven when a bikini is so low that the pelvis is bared, a rather rare occurrence, or when a bikiniite is caught cleaning sand out of the front of her bikini (AKA516).