I too have issues with some of these sex scene placements. Like the mood is all "I am in a rush and can't be distracted" and then next thing you know there is a sex scene before you are done. WHAT?! No, sex can wait, this thing needs to be done now!
Yeah these black screens are really bad. There is a good story telling rule that IS NOT being followed with them:
"Show. Don't tell."
Show us what is happening instead of telling us.