It's pretty common knowledge that the honeymoon phase doesn't last forever. At some point, the butterflies disappear, the passion starts to dwindle and cute sweet-nothings sound, well, less cute.
But thanks to the people at SoulPancake, it doesn't have to be this way. In their new video, "The Science of Love," they took eight couples who had been together well past the honeymoon phase and showed them how to keep the spark alive.
Watch the video above -- posted on SoulPancake's YouTube page -- to find out how you and your S.O. can keep up the excitement in your relationship for years to come.