The key, as Lindsey puts it in the video, lies with highlighting the woman’s curves, and you do that in this case using a short light position with your key light. Your second light, in Lindsey’s example, would actually not be pointed at the subject at all, but rather at your background as a background light, which helps to separate your subject from the background.
Don’t let the fact that she is shooting these in a studio hold you back from giving them a shot. The techniques and lighting positions here could easily be adapted to work in a more traditional boudoir setting as well, so get your speedlights out and give it a shot (or two).
For those interested, you can find some of the Rogue products mentioned in this video, here.