Boudoir

According to Wikipedia,

Boudoir photography is a photographic style featuring intimate, romantic, and sometimes erotic images of its subjects, primarily intended for the private enjoyment of the subject and their romantic partners. It is distinct from glamour and art nude photography in that it is usually more suggestive rather than explicit in its approach to nudity and sexuality, features subjects who do not regularly model, and produces images which are not intended to be seen by a wide audience, but rather to remain under the control of the subject.

It is usually taken in black and white or monochrome.