If you're wondering why f(x) stays away from sexy concepts, Amber seems to be the culprit.

Recently, f(x) members Victoria, Luna, and Amber appeared on the KBS 2TV's show, "A Song for You." During the interview portion, Victoria discussed f(x)'s tendency to not do sexy concepts.

"I don't think that as a woman, you need to expose your body and wear a short skirt no matter what to be sexy," said Victoria according to allkpop.

"f(x) stands out among the other girl groups that have sexy concepts through its uniqueness," said Super Junior's Kangin.

"To be honest, we want to expose ourselves through a sexy concept," continued the f(x) leader. "However, even though we want it, we can't because of Amber."

"If I expose myself, everyone will fall for me, so it's too dangerous," joked Amber.

During this episode, Amber, Luna, and Victoria also performed some of f(x)'s greatest hits, including "Rum Pum Pum Pum," and "All Night." Krystal is presumed missing to film her reality series with Girls' Generation's Jessica, "Jessica & Krystal."

Meanwhile, SM Entertainment has confirmed that Sulli will be taking a hiatus from promotional activities.

"[f(x)] member Sulli became mentally and physically exhausted from the continuous, malicious comments and false rumors, and has expressed her wish to take a break from her celebrity activities for the time being," said a press release from the label. "After careful deliberation and taking her wish into consideration, we will reduce her activities and let her take a break for the time being."

"Also, f(x)'s promotions for their 3rd full-length album 'Red Light' ended with their stage on SBS's 'Inkigayo' last week. f(x) will continue on activities with the SMTOWN Seoul concert on August 15 and overseas promotions, as well as individual schedules for the remaining four members Victoria, Amber, Luna, and Krystal."

Check out Amber, Luna, and Victoria performing on "A Song for You."