The ACIM urtext includes this curious parenthetical afterthought:
The sex impulse IS a miracle impulse when it is in proper focus. One individual sees in another the right partner for "procreating the stock" (Wolff was not too far off here), and also for their joint establishment of a creative home (21-22).
Who was Wolff? And what does this mean?
Christian Wolff was an eighteenth century Christian philosopher, whose writing and teaching was both controversial and popular in Europe.
Wolff was - for his time - deeply progressive with respect to human sexuality, arguing that sex “works better if both the man and the woman enjoy it.”
Basically, he was teaching men to think about women's sexual pleasure and well-being.
Thus, Helen Schucman's Jesus is endorsing Wolff's insight that in our sexual relationships, honesty, mutuality and communication are close to the Truth. Sex is not a replacement for pure communication with God, but when our focus is on our partner, we come very close to that level of peace and understanding.
It's interesting to note that this understanding of Wolff is a fairly recent development. It's hard to imagine (though not impossible) Schucman knowing this.