After a few days on the new Earth, the Lord called to Adam and said, "It is time for you and Eve to begin the process of populating the earth, so I want you to kiss her."
Adam answered, "Yes, Lord, but what is a 'kiss'?"
The Lord gave a brief description to Adam, who took Eve by the hand and took her to a nearby bush. . . Moments later, Adam emerged and said, "Thank you Lord, we thought that was wonderful!"

And the Lord replied, "Yes Adam, I thought you might enjoy that. Now, I'd like you to caress Eve."
And Adam said, "What is a 'caress'?"
So, the Lord again gave Adam a brief description and Adam took his beloved wife behind the bushes...
Quite a few minutes later, Adam returned, smiling, and said, "Lord, that was even better than the kiss."

And the Lord said, "You've done well Adam. And now, I want you to make love to Eve."
And Adam inquired, "What is it to 'to make love', Lord?"
So, the Lord again gave Adam directions and Adam went again to Eve behind the bush, but this time he re-appeared almost instantly... And Adam said, "Lord, what is a 'headache'?"