Yes, I have read stories of accounts that heavy petting can lead to this. …Can’t find any resources now, of course, BUT, I found this:
"It was only fitting that the mother of Christ totally submit, on behalf of all of us, to her special role. The beauty of using a virgin to give us a Redeemer is missed unless one thinks about the concept of virginity as it relates to the rest of us.
Virginity is indeed valuable. And it is not sacred because of this particular commandment or that particular rule of morality. It is sacred because totally submitting yourself to another is the greatest gift one can give. God did it for us. He showed us His soft side, so to speak, and continues to do it with the teachings of Christ and the Beatitudes.
It’s not corny to do it for ourselves, too.
As far as how he pulled off the virgin conception, I guess I really don’t care so much how as why. The HOW I can accept through faith; the WHY is typical of the beauty He offers us in this gift we call life."
gynob.com/xmas99.htm