For Forbidden Fruit, bareback means the opposite of open and is the act of eating forbidden fruit in the context of a threesome or group eating. Bareback eating is an act that can be performed with a group of people. You can tell a bareback eater when you see him or her eat, this person tends to raise his or her buttocks and hold onto his or her partner's waist. It is safe to assume that all three of his or her fingers are in her or his partner's vagina while he or she is eating..