What could I do to my man in bed to make him say something like "OMG! Where did you learn that?"

In all actuality, thats probably the last thing you want him to ask as you may end up explaining someone you really dont want to and you most certainly cant tell him you heard it from us, so youre really better off having him show you what he likes, as most guys want their better halves not to be too experienced so be careful for what you wish here as it may be more than you bargain for