If you mean would they let you take pictures of them, I very much doubt it. Many girls value their privacy and even those who are open about what they do are unlikely to pose for porn (I assume that was what you had in mind) for the same rate they take for appointments.

Depending on the woman, some will allow it, and some will even encourage it.

The woman who's pictures I have are typically woman who provide on the side, and who I have a great relationship with.  I most certainly will never ask a woman on the first few dates to take pictures.   OTOH if I have seen the woman many times, we have fun together, then the subject will be approached.  I even have some video of a few women giving me a great BJ.

All the women I have pictures of are just worried that they will appear on the internet.

There is a great program called Truecrypt (http://www.truecrypt.org/) which allows storing files in an encrypted file.  It has a great feature called: "plausible deniability" which means that even if someone finds the volume, you can put other stuff in it to protect the naughty stuff.