The physical pleasure is just a bonus, as I always say.
Making love makes you feel really close to the one you love, yes you can achieve this in other ways, but it is different. You're both mentally, physically and emotionally close to her/him(and THAT'S romantic!)... And that's what I like about it the most.
It's like... Well, you'll find out on your honeymoon I suppose. It is difficult / impossible to explain.

Maybe tonight we'll fly so far away... We'll be lost before the dawn...