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SemperReformanda said:

Why would they be disobeying the divine command to be fruitful and multiply? Being fruitful and multiplying isn't a sin except for when it is done outside the bounds that God has given us (i.e. a marriage covenant between one man and one woman).
Of course, this is all speculation on our parts. IMHO the mandate was given to be obeyed "somewhat immediately," and not with a long lag time. If God would not have desired a "somewhat immediacy" then He could have easily waited to tell Adam this mandate later. In addition,

1. Adam would have found his wife attractive, thus...the natural order that God had set in place would have....
2. There was no sin and thus conception would have been immediate.
3. What a honeymoon no sex for 100 years?

Reformed and Always Reforming,