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>>23188
If by "up for grabs", you mean "...only if you fulfill complicated and irrational social contracts and have the money to buy it", yeah sure.
Never forget, all adult relationships are a form of prostitution. You have to purchase the sex in the form of movie tickets, dinners, gifts, jewelry, or the very least your time which (being an adult who most likely must labor for the "privilege" of mere survival) has an equivalent cost at whatever you local minimum hourly wage is. The only difference is the money is first transformed from the symbolic into the material, nevertheless losing symbolic value through what is essentially economic entropy.
Children don't usually have to work to survive, because their parents pay for them to do so. This means their time is not worth money, so they can use it or give it without any associated "loss". And because both parties value sex for sex, they will agree to participate (which is consent) without needing to fulfill any social contract. A child usually can't "pay" another child for sex, not only because a child typically doesn't have anything of monetary value to exchange as symbolic value (as opposed to, say, a toy or Pokemon cards which are enjoyed as material); but also because if the other child wants it anyway, the rest is superfluous.
In a vacuum, outside puritan propaganda, no children would ever refuse sex. Why would they? It would be like refusing tasty food or a comfortable bed. So the idea that they can't "consent" to an activity they all naturally crave and enjoy is illogical at its very genesis.