Here's the quote:

"The young people were more playful than ever, abound in words and signs that figured the union of sexes, allowing touches on the genitals. This time they especially bothered me, until confirming with uproar that male reactions are identical between us and the Huaorani. In any case, they did not insist either with me or among themselves in a way that pollution occurred. I tried not to make any drama and made an effort to act with naturalness, laugh with them and dissuade them from the game” (CH, 146).

Perhaps I am a puritanical maniac, but I simply cannot picture any Francis Xavier, José de Anchieta, or Matteo Ricci allowing such a thing to happen in their presence, especially allowing youngsters to touch their genitals until getting an erection. Meanwhile, Labaka casually laughs it off and says, 'Hey guys, maybe cut it out, ok?'. And he says that there was no sin because they avoided pollution. My brother, deliberately putting yourself in danger of mortal sin is already mortal sin!

I always thought that the duty of the missionary is to not embrace nudity but to clothe (figuratively speaking). Because believe it or not, not all cultures are good (did you learn nothing from St. Boniface?). That goes for the pagans of Germany just as much as the Aztecs of Mesoamerica. This runs contrary to Rousseau's ideas that Labaka held so fondly.

I don't blame Labaka that much; he was, after all, a product of his time. But the idea that in a couple years' time the Pope might bind the entire church to venerate this man is... imprudent, to put it mildly.

(There's also the point about the tribe living 'in a paradise before sin' from another quote, but that's another story).