A toddler wanting something isn't greed. How the older children and adults around them respond and teach the child determines whether they turn out to be greedy as they develop because they have to be taught that they shouldn't take from others. Same as how physical contact like striking someone is either reinforced or discouraged, doing the wrong thing while finding out what is right and wrong when there is not an inherent biological urge behind the behavior is how humans develop.

Sexuality is one of the few things that we are born with and not the result of what we are taught.