For one thing, which tama version are you using? Be more specific next time, but, no they don't need to be adults to visit each other.
they must be the same versions to connect and marry. otherwise, only certain tamas can visit with other versions.
i have a v5 tamagotchi and i think bonds per means how close the siblings are to each other. for example, on my v5 my bonds per are 30%.
buy chocolates and give each other stuff
Depends on the situation.
No. Normally, adults tend to avoid conflict with each other, but big males will sometimes kill and eat cubs.
Because, when a mommy and a daddy like each other, they go and TAKE OVER THE WORLD!
There are many types of software today that allow adults to chat with each other. One of the most recognizable ones is Skype. Also for Fans of Apple there is facetime.
no they hated each-other and went to wars like the peleponisian wars
Nope. Teens can fall in love with teens (they CAN'T GET PREGNANT), and adults, young adults, and elders can fall in love with each other.
There is no issue with Jews visiting each other.
In Sims 2, for PC, adults and teens are not able to flirt with each other, kiss, woohoo, etc.
Adults might copy each other due to social influence or the desire to fit in with a certain group. It can also be a way to show agreement, show respect, or build rapport with others. Copying behavior could also be a form of flattery or admiration.