Data: we've done lots of manual stim and lots of oral stim. She's worried that she is "too small" for my penis. She's had Pap exams in the past, and the doctor used a pediatric speculum. I've done some gentle and shallow finger penetration, and she asks me to stop after a short time. Nonetheless, she'd like to do Penis in Vagina intercourse. I have not had a good look at her vaginal vestibule, so I don't know if there's any tissue in the way.
At what point should she seek medical advice to find out if vestibulitis or vaginissmus is an issue?