I just had to look up what, "magnanimous," meant. What a great thing to be called.
Please don't think this will happen to you. If that chick is 18 she probably doesn't want kids anytime soon, so she probably won't play that card. If travel is what she's after, she'll just milk him for all his dough and by that time he'll finally wake up.
In my situation, this girl is closer to 30, so she's ready to start her family.