They were in the next room watching it all on CCTV, ordering pizza for them, and giving tips on the blowhorn.
I mean, hey, no one knows what happened except them two, or rather, her, because chances are when told about it, his response wasn't, "Wait, what?" but more along the lines of, "Which one?"
Remember, this was so common, so acceptable with these stars, they used to write songs celebrating it.
Not saying he's guilty, just that the climate back then facilitated this sort of thing.