I'd have thought all young hookers are naive, don't you think so? They tend to be uneducated and therefore unaware of the health risks associated with their first profession.
But maybe the older ones who have remained in good health aren't, coz they're still around! But in China there won't be very many of them. That's because ignorant Chinese punters who tend to be less well endowed financially insist on having unprotected sex with them. And those older hookers are not in a position to refuse, because they will need the dough to raise their children, in the wake of a disastrous first marriage to a lousy Chinese husband that has ended in divorce.
And it's unlikely that young girls who are not hookers are naive enough to sleep with older foreigners, coz that definitely goes against the grain here culture-wise. So,they're not the naive ones! But there may be a few uglies from village backgrounds who nobody wants to sleep with anyway. They tend to sleep with young colored foreigners or old white foreigners, and quickly become pregnant. Their mothers are very angry about that, unmarried mothers in China are very much frowned upon. I'd say they're the only ones who are naive here.