'Believe' whatever you want; but there is ZERO evidence that GOD ever 'asked' them to give up NORMAL sexual relations with one another.
Matthew 1:25
And he knew her not till she brought forth her firstborn son: and he called his name JESUS.
It is not normal marital relations for newlyweds to not have sex during an entire pregnancy. Why would Joseph abstain all that time? It must have been unusual, or it wouldn't have been mentioned.
Love
O2