Julia Crenshaw is 18 years old. She began menstruating shortly after turning 13 and has had fairly regular 28-to-30-day cycles since her 14th...

Julia Crenshaw is 18 years old. She began menstruating shortly after turning 13 and has had fairly regular 28-to-30-day cycles since her 14th birthday. Although she has had sports physicals for school, she has declined to have regular pelvic examinations or screenings, explaining that she has not been sexually active and intends to wait until marriage. However, today during a