Jesse James Feels Kat Von D is WAY Better in Bed Than Sandra Bullock

Jesse James is singing the praises of his fiancee … which is nice.

Except for the fact that it’s sort of at the expense of his ex-wife. Guess he was serious when he said he’s done worrying about Sandra Bullock.

Set to wed Kat Von D this year, in what will be his fourth marriage, James isn’t afraid to compare his future wife to his scorned, former spouse.

In an interview on Howard Stern’s Sirius XM radio show Thursday, James was asked: “So who’s more fun in bed? Sandra Bullock or Kat Von D?”

“That one’s an easy no-brainer,” James replied.

“Kat von D?” Stern asked. “Yes, sir. 100 percent. She’s a vixen,” James said of Kat. “The way she gets in my head and how she makes me feel.”

“It’s a mental thing,” James gushed of sex with his bride-to-be, who stars on TLC’s LA Ink. “We’re just connected on a whole different level.”

James freely admits that he betrayed Sandra Bullock, but confessed to Stern that he never felt all that secure with the Oscar winner at all.

“I always felt like any moment that rug was going to be yanked out,” he said. “Yeah, she could stand there in front of the world and say she loved me, but in my mind I was thinking, yeah bulls**t … you don’t love me.”

Whether he’s blaming her or just explaining why he felt and acted the way he did at the time is unclear, but he didn’t cheat on her right away.

“It took a couple years,” he explained. “It was like a very short bubble… It was hard. I married America’s sweetheart, and she’s one of the biggest stars in the world, but I’m still this f***ed up kid from Long Beach [Calif.].”

“I did really love her and I did really care for her,” James insisted to Stern. “The stuff that I did that was bad, but I don’t think necessarily nullifies everything I felt. I really did have real feelings for her. The problem was me.”

Despite his affair, James and Bullock were still a happily married couple when they adopted a little boy together, Louis Bardo, in January 2010.

“We adopted a kid at that time and it brought us closer together and actually our relationship was in a really good place,” James noted.

“It was better than it had ever been in that moment. I hadn’t totally fixed myself yet, but I put all of the bad stuff I was doing in check.”

Things unraveled in front of the world when mistress Michelle “Bombshell” McGee sold the story of their affair to a tabloid in March 2010.

Bullock divorced James and his name has been removed from Louis’ adoption papers, with Sandra raising him alone from that point on.