commented on SL Letter of the Day: Rocky Mountain Rainbows
A rocky mountain rainbow occurs during anal sex when the giver induces vomiting in the receiver at the point of orgasm, in order to heighten the sensation (from the contraction of the sphincter muscle as the receiver vomits). This act occurs during both gay and straight anal intercourse.
The act is so named because it originated in Colorado in the 1950s. Though still popular in both Colorado and neighboring mountainous states (especially Utah), there are distinct regional differences in the methods used to induced vomiting. In Denver, the basic method of inserting fingers into the throat is prevalent, however a few short miles away in Boulder, receivers swallow chunks of raw bacon secured to a length of cotton, which is extracted with force to induce vomiting.
A mile High surprise occurs during anal sex when the giver performs a rocky mountain rainbow on the receiver without warning, either in a bathroom stall, either on an aeroplane or during a Denver Broncos game (which happens ALL the time).