Kourtney (left) and Khloe Kardashian

There’s a new kind of criminal on the loose: Kissing bandits. And the self-proclaimed band of amorous villains are all in the family, the Kardashian family.

Sisters Khloe and Kourtney Kardashian are single and have jumped lips first into the dating pool, they said at Barbie’s 50th birthday bash Monday night. “I’m a kissing bandit. I kiss then run away,” 24-year-old Khloe said.

On the hunt for “a sexy beast” after her January split from NBA player Rashad McCants, she said she’s really just “weighing out her options” and “having fun.”

Older sister Kourtney, 29, was quick to chime in: “I’m a kissing bandit, too. I can kiss.” But, she added, she won’t commit. “I have made a ban for myself – to be single. I cannot have a boyfriend until at least a year,” the currently single beauty said. “We’re just having fun.”

The two spent the evening huddled with a few guys around a fire pit outside of Barbie’s Malibu Dreamhouse, talking and roasting marshmallows for s’mores.

Meanwhile, 28-year-old sister Kim Kardashian’s romance with NFL star Reggie Bush is still going strong.