I absolutely understand what you're saying, Jules- and I agree, for the most part. It's amazing how powerful words can be- some of us learn that the hard way. And I think you are doing a very good thing, trying to help people in this area.
I do think, though, that more important than the words a married couple uses with each other, whether they call it 'having sex' or making love or whatever...far more important is the attitude behind it. If people are getting married mainly because they want to be able to have sex...then that's the wrong attitude and that's probably all it will ever be between them- sex. They could say they make love or call it anything else they want, but with the attitude they have about it, the words don't matter.
On the other hand, maybe a married couple is truly, honestly, openly intimate with each other in every way- spiritually, emotionally, mentally...everything. Then what they do behind closed doors, despite what they feel comfortable calling it...it's going to be love. It's going to be special.
...I sure hope that made the kind of sense I meant it to...