>>3308728I think it's because in some societies lesbian is frown on. So bi girls that are friends finds mutual guy they like to fool around with. No one thinks they're lesbian because it's so common.
You can tell when they like touching themselves together, or get jealous when guy gives attention to much on one.
>>3309056Guy here, yes you do, don't lie burger, very common in Korea and Japan. And not that hard to talk college girls into it either in America.