Removing a child from a parent is a harm (as witness the panicked parent). It's not so much a matter of consent, as of making people worry and separating them from their family.
If the child is returned before the parent knows they are missing? I am not understanding why the correlation is so hard to see. It is an analogy, not a mirrored situation. Kidnapping is not seducing. There are differences. The original point was that seduction involves coercing children. Kidnapping can do the same thing. So can brainwashing. All three of these (kidnapping, brainwashing, seducing) can produce harm but may not and arguing about exactly when "harm" happens is not really useful. The relevant question is exactly this:
BTW, this line of argument doesn't get you to "no sex", it gets you to "no sex without parental consent". Fair enough, now what if they say "yes"?
I am not arguing for any particular stance. I just saw an interesting correlation between seduction and kidnapping that involved coercion. If I remember correctly, the laws in some states get remarkably relaxed when minors have their parents' consent. I could not tell you specifics, however. If you find this sort of thing interesting I am sure it is relatively easy to find information about sex with parental consent.
The bottom line: A child will do an awful lot to please someone. Is it okay to coerce them into doing something? Does it matter if they enjoy it? Does it matter if there is harm? Does it matter if they want to do it?
All of this also assumes "seduction" instead of a real, true romance. I would assume that a real, true romance has less coercion. (Or, at the very least, thinks it has less coercion.)
Perhaps we're being confused by your use of the verb "seduce", since to me that doesn't include non-consensual means - it usually implies cunning trickery at worst and goal-directed charm at best. Can you restate without using it?
What do you believe that most people on this site don't?
I'm especially looking for things that you wouldn't even mention if someone wasn't explicitly asking for them. Stuff you're not even comfortable writing under your own name. Making a one-shot account here is very easy, go ahead and do that if you don't want to tarnish your image.
I think a big problem with a "community" dedicated to being less wrong is that it will make people more concerned about APPEARING less wrong. The biggest part of my intellectual journey so far has been the acquisition of new and startling knowledge, and that knowledge doesn't seem likely to turn up here in the conditions that currently exist.
So please, tell me the crazy things you're otherwise afraid to say. I want to know them, because they might be true.