The boys' father, Kevin Jonas, also the band's manager, said love is a distraction. A recent trip to the dentist, he said, ended with a police escort because of all the girls who swarmed the building.
"You know, somebody asked them the other day 'So if you actually had a girlfriend, would you tell us?'" he said. "And the answer was, 'No, I wouldn't tell you.'"
Denise and Kevin Jonas have seen too many examples of what not to do, so they try to keep the drama surrounding their sons to a minimum.
"We've tried to show them examples of people that have basically started with success and found the road difficult," dad Kevin Jonas said. "Maybe they went off track, hit a hard streak, some people were disloyal, they stopped trusting people. And look at where they ended up."
Nick Jonas has incorporated his own personal struggle into his music. Just as the band was gaining attention, he was hospitalized and eventually diagnosed with Type 1 diabetes. He later wrote a song about the experience that he sings at every stop on the summer tour.
As far as school, Kevin Jonas has already graduated from high school and the other boy are home-schooled, or rather, bus-schooled.
Despite spending so much time together, they really are three separate young men. Michelle Tomaszewski, who used to work with Britney Spears, is in charge of putting their look together.
"Kevin is the more kind of aristocratic rock-star," she said, adding that he likes to wear clothes that make him "a little bit more grown up."
Joe, she continued, "likes to wear the red pants or neon pants. He's more of, like, the risk-taker."
And the youngest Jonas brother, she said, is more subdued, calling him a "kind of laid-back, like, chilled guy in a T-shirt with a leather jacket and jeans."
If you want to know what else is happening with the Jonas Brothers, they blog every day on their Web site. Staying in close touch with their fans seems to be a strategy that is paying off.