Final answer:
The most likely diagnosis is endometriosis, a condition where endometrial tissue grows outside of the uterus and causes pelvic pain.
Step-by-step explanation:
The most likely diagnosis for a 32-year-old G0P0 woman experiencing dull, crampy pelvic pain that worsens with menses and pain with intercourse is endometriosis. Endometriosis is a condition where endometrial tissue grows outside of the uterus and causes inflammation, pain, and scarring. The main symptom is pelvic pain, which can range from mild to severe and may occur during menstruation. It can also lead to infertility.