mmm, actually the only time it can be proved that they slept together is on the bantu wind (besides 10 years earlier). in fact, it is implied that indy falling asleep was fake, as marion is WITHOUT HER DRESS the next morning, and grabs it with a smile on her face after indy puts his clothes back on. if indy had just fallen asleep, it would have been kind of pointless for marion to take off her dress.
but yes, after the drink is another option, but imo, the more romantic and most implied is on the bantu wind.
i'm still hoping for henry jones III and he just doesn't know the last name and is only told that the kid's name is mutt. i mean, hello. i think marion knew who the daddy of her baby was. also--abner is just far too cruel to a kid. lol. henry is acceptable. if abner was his real name, his name wouldn't be abner ravenwood, jr., it'd be abner jones. yeesh.
could it possibly be he finds out during that "pivotal chase scene" through bedford? i mean, marion has to come back into the story pretty early on, and that would definitely force a confrontation.
my thoughts are that maybe they have to go rescue abner or something. notice john hurt and cate blanchett aren't working in the same group portions as harrison, karen, shia and mac. i bet cate's character has abner. that would explain why john hurt wasn't in the group--because a lot of his scenes might be separate.
i think it is pretty safe to say that all the young indy bookends minus harrison ford's appearance are officially moot. why the need to force indy to have a daughter because the not-so-canon tv series said so before they needed him to have a son for the official canon movies?