"Desire is wonderful platform for established couples to build more spontaneity and play into their interactions. Once a couple has been together for a while, there is some routine and predictability that is expected and sometimes necessary to keep a household and life going. The truth is couples who have novel experiences together report increases in love feelings and relationship satisfaction," said Shula Melamed, MA, MPH. "Desire is also great for newer couples because it gives people a fun framework within which they can explore each other's preferences and proclivities. This play can also prime couples and assist them in the sometimes awkward (but very important) endeavor of discussing and sharing desires and fantasies," she said. Plus, it's free, so you can get the Desire app at no charge.