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There are multiple reasons as to why this love could be considered the purest. The first and the second most definitive reason would be because they aren't holding hands before marriage. This sort of pureness.doesn't exist anymore.
Both of them lack dicks, so they will forever remain virgins, unless they're degenerates, so their bodies themselves will forever be pure.
Of course, the biggest reason this love is pure is simpler. It's just that this love doesn't exist, and what doesn't exist cannot be unpure, because it isn't even a thing.