It does however mean that if you put the major plot revelations in sex scenes, a certain percentage of your audience will not notice them.
8(a).] don't put the crux of the plot in the middle of the homoerotic kissing scene you've been building to for three books: nobody will notice. Even the ones who aren't skimming.
In combination with 1), this DOES suggest an avenue or two for the subtle planting of clues...