My thinking is, that the default would be an even number, since most boobs come in pairs. But there will definitely be outliers, where a singular boob has shown up. These instances, I assume, have a 50/50 chance of having occured an odd or even amount of times. Thus, my math works out to there being a 75% chance of having seen an even number of boobs. Am I completely off?

Id like to say even

Depends on whether side boob counts.

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Side boob definitely counts, and accounts for most of the single boob sightings.

But if you've seen a single lone boob followed by a million pairs, you've still got an odd number.

This requires further study...

Extra info required: Does only seeing one boob even if she has 2 count: like sideboob