Explicit sexual intimacy is mostly expected to remain hidden and private in our love culture. While this secrecy is a necessity for cheating correctly, it also aids rapists and assailants in abusing their victims and getting away with it.
The unspoken assertion of indecency impedes proper education about good and respectful intercourse from the get-go. When porn is the only available external reference for what is acceptable, many victims tolerate varying degrees of the inappropriate, not knowing better.
And apart from spaces that invite open sexuality, privacy remains the only acceptable location for intercourse. You are forced to go on your own, regardless of how much you actually trust the person of your desire. When you are alone, nobody can help you.
This is truly convenient for all kinds of predators. For their success it is enough to emulate social conduct until absence of witnesses is reached.