Definitions by Bushfire
Bush Fire
A sexual activity involving some of the original characteristics on sexual intercourse, but adds the element of fire. The female's pubic hair is lit on fire while the male inserts his penis. They continue to have sex until the "bush fire" is extinguished.
Wisconsin sunburn
When a male, during sexual activities unloads semen onto his partners chest, then the partner must go outside and tan, they semen will then create a very neat tan line
Wisconsin sunburn by Bushfire September 2, 2015