"When I dated white guys, it wasn't as passionate as my relationship with Wilmer," said Lovato, who is of Mexican descent. "Maybe that's just Wilmer. But I do believe that Latin people are just more expressive, more passionate with their emotions."
Valderrama was born in Miami, Florida, to parents of Colombian and Venezuelan descent.
"He's very manly, and he can be stubborn like Latino men can, but he's protective and he cares so much and loves so hard," Lovato continued. "I've been blessed enough to have him in my life, and just as my man, but also my best friend."
The happy couple celebrated their six-year anniversary in January by sharing a sweet snapshot on Instagram of the pair cuddling in bed.
While they are inseparable now, Lovato explained to ET earlier this year that they almost didn't get together because of their 13-year age gap.
"He had some hesitations," Lovato told ET. "Once I got older, we could be together. He's my best friend."
In her interview with Latina, Lovato also touched on fellow singer Kesha's ongoing court battle with Dr. Luke.
"I thought it was extremely brave of a pop star in the industry to come out and talk about that," Lovato said. "I do believe it's very f**ked up that he's not letting her go, aside from all of the other stuff. I think women artists shouldn't compete -- we have to support each other."
Kesha and Dr. Luke will continue to face off in court over the singer's allegations that he drugged and raped her a decade ago, and continuously abused her both physically and emotionally from the time she moved to Los Angeles to pursue her career in 2005. Dr. Luke has denied all wrongdoing.