How good do you want to sleep at night?
First of all, welcome to California!
Now; what is going to determine the nature and extent of liability is whether you want to be a promoter, or an advertising executive, or an employer, or an agency, or what? Because merely disclaiming that the maids are self-employed may appease the I.R.S. and be a help to you at tax time, but it will do no good to limit your liability. Because by saying that you are "opening a lingerie maid service" you have already announced to the world that you understand and have assumed and accepted all liabilities; be it directly or vicariously.
And of course you should have some sort of writing (contract/agreement) between you and the women who would be doing the maid-work, but by the same token, the type of writing and the words used in those writings are going to determine whether you will be on the hook and in the dock should the proverbial ever hit the fan! And if Murphy's Laws are anything to go by, then you can be sure that it will hit the fan sooner or later.
Because if you are going to be promoting the maid services on your own website and derive an income from the services provided by the maids directly or indirectly through and or by residual, commissions, finders' fees, kick-backs, back-hander, under-the-table, or by any other method one would care to call it, then you are and will be held vicariously responsible for the maids' tortuous acts and liable to the would-be plaintiff for any damages regardless of whether they are payroll employees or 1099 independents.
But if you are going to be merely providing an advertising vehicle, similar to Yellow Pages® where your involvement in the matter would start and end with the insertion of the ads for pre-determined and one-time payments, then you would have no worries and no sleepless nights.
So give it some thoughts!
fredrikklaw