Creep weird and wrong IMO. We have teenage kids, we joke around about masturbation we are a very open and honest family - however there comes a time after say 14 or so, where you shoud just butt out of your kids sexual identity. I know they are equiped with all the knowlege, how they use it is up to them.
I would be seriously concerned if my husband expressed any interest in how often and where my children masturbated.

I do not think Dolfettes post as out of line, and there are more than plently of MEN posting here saying the same thing.