There is no cheat, if you want Sims to get married you build their relationship up to a romantic one and then have one of them propose.
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There is no cheat for Mcdonalds in the Sims 2 or 3
Have your Sims get married (must be adult boy+girl, unless you have teenager cheat) and a limo will come to pick them up for their wedding.
your sims can't get married in the sims 2 Castaway for the DS.
No there is not a cheat to make a sim pregnate on the sims 2 for ps2
No there isn't.