Does the 7 year itch exist?

Tonnina • Married with two Chinchillas for babies for now! TTC date of April 25th, 2017!
They say "watch out for the 7 year itch!" When you or your partner have been together or married for 7 years either of you start to get itchy for some strange on the side.
Did you experience this? Did you get past the 7 year mark with no itchiness? Did it happen sooner than 7 years? Later? Just curious what people think!

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