I've had a hard to find some options too. I second ClayMask on the fact that children and teen can be tutored without homework in inventory, and that you can always find the option under the family oriented special menu when/if it doesn't show up under friendly.
This was already like that for me prior the last patch and Generations. I've found that, ever since I installed them, it's somehow getting worse or more confusing at least. Not specifically for the tutor one, but also other interactions. I've had a very hard time finding "ask for campaign donation" and "ask to form/join band". And just "get to know" is not always there for acquaintances... when Sims can now share secrets with complete strangers!
My (very woolly) theory so far: when 2 Sims have a friendly conversation, you can see what the other thinks of your active Sim under their icon on the top left. It changes from Sims x is ok, to sociable and then friendly, when everything goes right. I've been under the impression that some interactions require Sims to be on a higher level (sociable or friendly vs ok) than before. So that now, they must have a whole conversation before thay can ask things that were common before.
I also feel that the last EP/patch has brought in all kind of side tweaks and small changes, but none of those have been explained nor documented be EA so far. And some might need a bit more fine tuning for the next patch
But the whole system now seems a bit more interesting or intricated now.