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1.
"Absence makes the heart grow fonder". When a couple haven't seen each other for a while, the next time they meet is going to be their hornymoon.
Wife: I missed you so much when you were in Germany. Good to have you back. It feels like honeymoon again.

Husband: Yeah, 5 times last night. Now it's more like hornymoon.
by Nomanches October 24, 2012
 
2.
It is the traditional holiday taken by horny newlyweds to celebrate their marrige in intimacy and seclusion.
Las Vegas is a perfect place to go on a horny moon.
by Karla Cisniega December 08, 2008