Declaring income is okay.
Not declaring income is just begging to be investigated, fined, and sent to prison.
The US Bureau of Labor Statistics has an occupational classification that many providers can likely use, called "27-2031 Dancers", when filing taxes or making cash deposits in a bank.
http://www.bls.gov/soc/2010/soc272031.htm With that job code above, making cash deposits is within the expected mode of operation for an exotic dancer. The banks will still file a Currency Transaction Report (FINCEN 104) for deposits over $10k as they do every day on many transactions. They've filed on me for pulling cash to buy a car, and for depositing that amount back in at a later date.
https://www.ffiec.gov/bsa_aml_infobase/documents/forms/Form_104.pdf
http://www.irs.gov/pub/irs-tege/fin104_ctr.pdf The performer is expected to pay typical income taxes on the declared income, but at that point the funds are able to openly traverse the banking system both domestic and abroad.
If the feds decide to charge someone (even me) with civil asset forfeiture because they can't charge me with a crime but want to punish me anyway, then the Institute for Justice would be my first stop for directions on how to fight it.
https://www.ij.org/bad-apples-or-bad-laws
If feds do declare civil asset forfeiture then they may confiscate all your funds within the financial system and leave you to twist in the wind as you wait for your day in court - meanwhile you can't pay a mortgage, buy groceries, gas, car payment, or your legal fees. It's worthwhile, in my opinion, to keep several month's worth of expenses separate from a bank account - be it cash in a safe deposit box, a home safe, a trusted friend, or traveler's checks in similar locations. Doesn't matter who you are or what you do; until this wretched practice is revamped, the risk is relatively high for those who deal in cash, but also relatively easy to mitigate.
I hope providers have good accountants and tax advisers to keep things straight. Also good to have set up a pre-existing business relationship with a lawyer (personal will, trust, etc) in case you ever need to make that call. He may refer you to a specialist, but the time saved can be huge.