I am feeling compelled to add that it was entirely out of line to ask your teenage son if they were having sex. As a child who was subjected to her parents sex lives in way more detail than any child should ever be, I speak to you from experience when I say this is creepy and damaging.
Love is that condition in which the happiness of another person is essential to your own...
Robert A. Heinlein
Me: female, bi, (formerly hinge of a vee)
with FirstBoyFriend (FBF)(moderately long-distance)
and no longer with CurrentBoyFriend (CBF)(who now lives in a house far away-with stairs I can't climb)