boudoir photography centers on seductive photos of women.
however collectors of historic photography may seek boudoir cards. & these can have as their subject matter anything from an Indian chief to a scene of tornado destruction. here's a boudoir card from 1887 which shows a man who was shot thru the head.
the term "boudoir card" has nothing to do with sex. it's all abt size. the size of the item that is. such cards were 5 1/4" x 8 1/2". a size larger than a cabinet card (which in turn is larger than a carte de viste). & that size was of the cardboard mounting. the actual albumen print was of course smaller.