[asciimo]

I don't think you should massage your sample into giving you an acceptable answer. No matter how you shuffle the words around, it comes down to the blunt action of "submitting your email address" or "submitting your body measurements." If your target demographic is repulsed by the bare truth, you have to decide whether it's worth combating this reality with a "market play." It might be better to change your target demographic, or your product.

[mynewwork]

But people will say and do different things substantially by how it is presented. "Would you carry around a device that lets a company track your location 24/7?" will get people to answer "no" who have a cell phone in their pocket. If you had asked the general population 10 years ago if they would give a company a list of all their friends, their hobbies/interests/religion/political beliefs and all their photos they would have shouted no, of course not, but they do that with facebook today.