Girl-on-girl refers to sexual activity between two females. It is also a specific genre of pornography.
More About Girl-On-Girl (GOG)
Girl-on-girl generally refers to sexual activity between two females. Girl-on-girl sexual activity within the genre of pornography is not necessarily specifically homosexual in nature. The females that participate in girl-on-girl pornography, or even in daily life, are not necessarily homosexual females. Girl-on-girl is sometimes considered a type of sexual fetish among both men and women. It is a common turn on for both men and women to watch GOG action or porn.