During that important pre-consultation with a client, most likely, she will ask to see an entire session. They have seen your amazing images on social media, but usually just one or two from a session. If you only show a few images from each set, how does your client know if those just weren't the best of the best?
Having an album or video slideshow of an entire session can help them to visualize their own session without wondering if those two shots were the best. Knowing you have the ability to capture an entire session of images they can choose from will benefit both the client and yourself. They will see how you work, your policies on number of wardrobe changes (if any) and how you can create different looks with the same setup.
In many cases, if a client sees one image as a standalone, she may not choose it if it looks similar to a second. Explaining how they complement one another in the album can help increase the chances of purchase. If only one image was shown, only one image can be bought.
Another reason for showing a full session during the pre-consultation is to explain the wardrobe options. In my studio, I do not limit the amount of wardrobe changes, as it just means more images she can choose. Showing the client many options and how each look can drastically change with the background will help her visualization as well.
In the session, I applied very quick Lightroom edits and complied the culled images into a brief video to show my clients. The only difference is I left out the other 25 images that showed nudity per the request of my client. However, when in the studio, many clients will want to see the implied nudes or full nudes, so make sure to have those available as well (if you do not have a client model release, you can always hire a model for this specific reason).
So, while showing one or two on Instagram or Facebook is great to get those leads into the studio, having the option to show a full gallery display of the session will help secure that client. It is not hard to put together, as it is just for show, and your client will appreciate the effort you put in to helping her understand what a full boudoir session can look like.