I bet a lot of parents make this mistake: "she's only 15" but let's face it -- a 15 year old is pretty much a young woman. She is physically able to start a family. In a different age or culture, she would be getting married soon.
As a corollary, I would also point out that a man attracted to her, or even wanting to marry her, would not be a "pedo" even if he were 30 or 40 years old. A "pedo" is a pervert who desires pre-pubescent children for his sɛҳuąƖ gratification. A 15 year old young woman is NOT pre-pubescent.
I know messed-up America cares more about a man dating a 17 year old woman (this is a crime in America) than it does about Abortion (not a crime in America) -- but that's why I call America "messed-up". A man desiring a woman in the flower of youth and beauty is NOT unnatural -- quite the contrary!
For many cultures, it was normal and expected for women to marry at 15 -- or even younger. They went with nature: when a girl becomes a woman physically, they took the hint and allowed her to enter womanhood.
We might criticize this, but let's look at our culture. We allow men to be "boys" long into their late 20's and even 30's. Living with Mom & Dad, playing video games, watching movies, "hanging out", going to College, then grad school, etc.