It is not common to see a tap out in a grapevine hold which is generally used to get a pin and a fall count. However, it happens (I don´t know whether for real, totally fake or somewhere in the middle). The first segment is just an exercise (source unknown) where one of the curvy girls uses the grapevine and her bosom to "extract" a submission. The second case is better (and in the nude!) as Francesca uses her free hand to give up to Candie (California Supreme CS194). The third is the more realistic, when an exhausted Misty taps out under Kyla pression (SuiteFights).
The grapevine can cause a submission for sure. If positioned tightly pressure can be applied against the knees and inner thighs. I've seen this several times in very competitive matches so not a staged submission.
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