What Does Deep Throat Mean?
Deep throat is an oral technique where she takes you fully into her throat. It takes skill, and only some ladies offer it.
The short answer
Deep throat describes oral sex where she takes you all the way into her throat rather than just her mouth. It is a technique that takes practice and a relaxed throat, which is why it is listed as a separate service and not assumed.
With or without
Deep throat can be offered with a condom or without, depending on what else the lady lists. If her profile shows OWO as well, ask which she prefers; if it does not, expect protection. Either way, the decision is hers.
Making it good for both of you
Let her set the rhythm. Pushing, holding her head or trying to speed things up will end it quickly and sour the mood. Patience, good hygiene and a little encouragement make for a far better experience, and the ladies who offer it tend to be proud of how well they do it.