Very attracted to my son's girlfriend - Is it normal?

Well, you may have these feelings, but you have to come to terms with them and figure out how to get them out of your head. Acting on them would be sick beyond all reason.. Rent a movie thru netflix or wherever called "Betrayal" starring Jeremy Irons, Miranda Richardson and Juliette Binoche. That will open your eyes as to what can happen when a father goes after his son's girl. And it ain't pretty. Try to distract yourself from these inappropriate thoughts, and whatever you do, DON'T ACT ON THEM. Trust me.