Girls, 18+ ADULTS ONLY: for women who “know” the size of the biggest cock/erected penis you’ve been with sexually, how do you know?

Background note: I’ve seen questions on here asking women what’s the biggest guy they’ve been with, so it made me wonder how do women know for sure—have they ever measured it?
Select age and gender to cast your vote:
Updates:
8 mo
If more than one answer applies, then vote for the one that’s about what you’ve done—for example, if in the past you’ve believed a boyfriend regarding what he said his size was, and also estimated another’s size, and measured one or more guys then select “I MEASURED IT”
8 mo
CORRECTION: this question is about the biggest cock you’ve had... so, for the one that you think is/ was the biggest—why is that one the biggest? (Select the voting option for why you think that “your biggest” is/was the biggest).
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