The term "gynecology" refers to the branch of medicine that deals with the health of women's reproductive systems. When applied to photography, especially in the context you've mentioned, it suggests a photoshoot that might focus on themes related to female reproductive health, femininity, or the female form in a medically or artistically inspired setting.
She is a prolific model for photographer Petter Hegre and has appeared in numerous photo sets and short films on his platform, often praised for her "natural beauty" and "perfect figure". Hegre 25 01 14 Anna L Gynecology Photography XX... 2021