The most common term is boudoir photography.

Boudoir usually refers to intimate, sensual portraiture, often photographed in lingerie, robes, sheets, or implied nude poses. It is typically styled to be flattering and tasteful rather than explicit. Depending on how far the session goes, some people may also describe it as glamour portraiture or fine-art nude portraiture, but boudoir is the standard term most clients and photographers will recognize for this kind of request.

A good approach is to use clear, professional language in your portfolio and client communication, and define exactly what you do and do not offer.