some characters are more resistant to being dominated, goblins in particular are difficult, when trying to get the oral satisfaction ending for the goblin it has taken 64 tries without success. I think it's easier now but still rather difficult.
Some characters outright can't be fucked into submission. If you look on the right side there's an arrow tab that you can pull out over the combat dialogue that lists the ways they can be beaten like orally satisfied, dominated, or lose to them like orally knotted.
Different techniques alter your status like how aroused (quickly you will cum from an activity) or how much stamina they take up as well as changes the word flavoring.
As far as hunger goes, you pick up food, you can forage while resting, convince a dryad to share, drink from the healing lake, buy food from vendors, suck dicks, and get a hunger charm from a cashe which reduces food requirements.