Where there is one victim, there may be more.

The Topeka Police Department's Juvenile and Special Victim Unit is using that theory in its investigation of a sexual assault that occurred at what it is calling a "flip party."

According to slang used in hip-hop music, the term "flip" means several people taking turns having sex with one person.

Police said young teenage girls typically are invited to a "flip party." When they arrive, the girls are alone with several males.

According to police, the girls are enticed to remove their clothes and have sexual contact with one or more of the males.

If the girls refuse, they are assaulted and raped.

Detectives said there may be more victims who are reluctant to report this crime.

"We only have one case that we know about," said Maj. John Sidwell, Topeka Police Department spokesman. "But detectives suspect there are more."

Police said descriptions of males involved in the flip parties have varied, so no additional information was being released.

However, detectives are asking other victims to call to provide better descriptions or names of males who have been involved in the parties.

In the meantime, Sidwell said, parents need to be aware of where their teenagers are going. If the teens are going to a party, he said, parents should receive assurances that supervision will be provided.

If there is any doubt about the supervision or participants at a party, Sidwell said, the teens shouldn't attend.

Sidwell added that precautions need to be taken for both boys and girls in their teen years to ensure their safety and well-being.

"Teenagers as a whole have a tendency to get into situations that are way above their heads without the supervision of parents," Sidwell said. "It's the parents' responsibility to watch our for them and try to keep them in safe situations."