I think this could be a legitimate question - in as much as not everything aimed at adults need be pornographic.
"Adult" can simply mean something besides toy cars, Sponge Bob, puzzles, or toy soldiers. Certainly it is great to get families and kids involved and they find their rewards. But, perhaps adults, even single adults enjoy the sport as well?
If someone wants "Porno-Caches" they could go and start their own group (named as such) separate from information and finds that families and others want.
Life is what you make it.