Her os (opening in the cervix) is round because she has never given birth; the os becomes more of a slit after childbirth.
On the sides of the photos, you can see her vaginal rugae, which are the ridges that make the elastic muscular canal of the vagina able to open/expand dramatically during arousal and childbirth.
Each photo was taken at approximately pm every day starting the first day of her menstrual cycle.
For the duration of this project, she used condoms as her birth control method so as not to introduce semenal fluid into the photoshoot.
She did not use tampons or mooncups during her menstruation either.
This is a graph of her basal body temperature for this cycle.
As you can see, after ovulation on about day 20, her temperature began to rise due to the heat-inducing hormone progesterone produced by the corpus luteum.
This temperature shift signifies that ovulation has already occurred. Check out more information about the Fertility Awareness Method of birth control to learn more about cyclical temperature changes.
You may notice on the right side of some photos, some jagged looking skin, which is the remnants of her hymenal ring.
This cycle is of normal/average length for her, about 33 days.
Her cycle’s follicular phase (variable number of days preovulation) lasts until about day 20 or 21.
Her fertile phase lasts from days 13 to 21 with ovulation on day 20.
Her luteal (postovulation) phase is 13 days long (12-16 days is the norm and is not variable in a normal cycle).