"Say what you mean," McCarthy tells PEOPLE. "No one has the energy for mind games."
"Jenny is the first person that I’ve been with where I don't have a giant question mark over my head," Carrey says at the Saturday Night Spectacular poker event he hosted with McCarthy at Miami's Bank of America Tower.
But how do they keep their relationship on track? "Communication," McCarthy says, before ticking off other important factors. "Being turned on by each other. Being each other's soul mate."
"When you're not turned on, there's generally something to talk about," Carrey interjects. "So, it’s good to listen to that."
Carrey, 48, and McCarthy, 37, hosted the event to raise funds for their autism organization, Generation Rescue. "This is so important," Carrey says. "Everyone knows someone who has been touched by autism. It's important to know that there is hope."
It's an issue that hits close to home for them both. McCarthy's son, Evan, was diagnosed with autism in 2004. Since Carrey started dating McCarthy, he and Evan have developed a close bond. "I think a man who is good with children is sexy," McCarthy says. "And Jim definitely is. He loves Evan so much."
With Valentine's Day around the corner, does the happy couple have any big plans? "I don't know," McCarthy says, before turning to Carrey. "What are we going to do?"
He just smiled: "Every day is Valentine's Day, baby."