Well, the sims can buy there own house (move out on there own), enjoy there romance, and ofcourse if your talking about the sims castaway for the computer then they can have kids and raise them.
Cast away its way better
You cannot make a sim nude in Sims Castaway.
Of course sims can get married in the sims 2 open for buisness Yes, sims can get married in the sims 2 open for buisness
your sims can't get married in the sims 2 Castaway for the DS.
yes on most consoles your sims can get married.
yes you can get married in the sims one two three four and hopefully the sims 5
You can't get married.
you make freinds with the other people and ask them to join your tribe
YOU CAN GET PARROTS AND MONKEY AND LOTS MORE ANIMALS ON SIMS CAST AWAY
No.
you ask them to get married simple as that
Since Young Adult Sims can't get married at all, your Greek Sims can't get married either. Sims can't get married until they become Adults.