BlueDahlia77:

I think another way of looking at this is that the mom is being respectful of the couples burgeoning sexual activity. Yes, the boyfriend tells his mother when they are going to have sex, but as far as the girlfriend knows that's all that he says to her.

I agree, if you can't discuss these things then you are too immature to do them. This girl thinks that discussing sex is icky when it is the healthiest thing to do. No- communication leads to bad things. It is like when a girl says she didn't mean to have sex, it just happened. Well, if you had discussed these things ahead over time it wouldn't have just happened. His mom probably isn't hearing inappropriate detail about sex, just discussing responsibility. When the girlfriend is out of the picture, this young man will still have a responsible attitude toward sex.