There is no line of demarcation between child porn and adult porn. The age of consent to have sex varies country by country.

If we were to start arresting men on the basis of them coercing, intimidating, and threatening girls/women to have sex with them, most every man on the planet would do time at some point or another. It is the way sexual politics works out. Definitely to men's advantage, but then, who is going to stop men from threatening women in order to get into their jeans, hmmm? Women benefit by this system too, don't forget. The threat to withdraw financial support is probably the most powerful, and oft used. But I would guess threats to reveal some aspect of a girl/woman's personal life she doesn't want revealed would have to run a close second.

Women engage in these games too. They just are less successful at it, because they are so much less powerful than men in every society on the planet. Which is why they play the game of false accusations.