Most females engage in sexual acts with another female before they're 14.
Most females engage in sexual acts with another female before having sex with a male.
sources?? lol
between the two i would have to say the oral and orgy would be more profitable than strictly girl on girl shit... orgy = girl on girl shit as well as oral and money shots, etc etc etc...
or did you mean profitable as in income less expenses for 2 actresses as compared to many actors and actresses?