Nope, I have no biblical evidence of this, but I think the earth would accommodate - grow, change in dimension, whatever.
But, pretend the earth won't grow. If we remained perfect, I don't think we would have the "want" to have many kids in the first place. Borrowing from biology, we wouldn't have the need to be immortal through genetics because we would have been immortal through Providence. So even if people had multiples, on average the population of the planet after 40,000 years may be comparable to what it is now (to "guestimate").
And, I think we would be allowed to explore and possibly stay at any of the many "mansions" God has built in the universe. God appointed four stars to Adam; that is at least four stellar systems.
On Intercourse it is very simple: our view of it is polluted because we are carnal. The command to be fruitful, and multiply was a vindication of, and justification for their role in procration/"co"-creation given to them by God. It was a commandment given to go through the physical activity of spiritually uniting with your mate/spouse - to become one flesh. This is why divorce is nothing spiritually for people who have "married" under God - by having sex.
We are carnal. We are constantly polluting things, and justifying it. Sex is no different. (So, you may see why I may be in the extreme minority on my views about sexual behavior and activity.)
Where does the Bible said Adam had four solar systems? What do you mean by earth growing and changing in direction?
Without death and work, what about inheritance and property in a marriage?
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