They can see her pussy.
"Is it practical or even desirable to regulate this? Consider how many tourist snaps the average Londoner appears in. And ask yourself: when you travel abroad, do you seek permission of everyone standing under the local landmark before you take your holiday photos?"
It is already regulated.
"Publicity and Privacy Rights of Individuals
You may need permission to photograph people due to state laws giving individuals privacy and publicity rights.
"Most states in the US recognize that individuals have a right of privacy. The right of privacy gives an individual a legal claim against someone who intrudes on the individual's physical solitude or seclusion, and against those who publicly disclose private facts. Unless you have permission, avoid publishing or distributing any photo of an individual that reveals private facts about the individual (particularly if revealing those private facts might embarrass the individual).
"Almost half the states in the US recognize that individuals have a right of publicity. The right of publicity gives an individual a legal claim against one who uses the individual's name, face, image, or voice for commercial benefit without obtaining permission. In case you are wondering how the news media handle this, newspapers and news magazines have a "fair use" privilege to publish names or images in connection with reporting a newsworthy event.
"Be particularly careful about celebrities. Using a photograph of a celebrity for your own commercial gain - for example, posting a photo you took of Clint Eastwood on your business's marketing material or Web site - is asking for a lawsuit, even if you took the photograph when you ran into Clint on a public street.
"Commercial photographers avoid right of publicity/privacy lawsuits by obtaining photographic releases from people shown in the their shots. If you are considering selling your photos or using them on your Web site, you may want to do the same. The Multimedia Law and Business Handbook contains a sample release. Experienced performers and models are accustomed to signing these releases."