To me, boudoir is similar to glamour but is often about showcasing fantasy that is often steeped very much in reality, as these images are very often gifts for significant others. For a brief moment in time, a boudoir client is a glamour model, in front of the camera, creating fantasy.
Boudoir also celebrates beauty, but in a more obvious sensual way. Boudoir photography subjects are often wearing lingerie. And, as the name suggests, it takes place in a bedroom or other private location. So, along with boudoir being about a woman getting sexy and alluring photos taken of herself, the other important aspect of that is it’s also a way for a woman to celebrate, acknowledge, and express her sexuality and her body. It’s a very personal and private thing.