re: Kissing in long-term relationships, I found an article you're likely to enjoy, TheTexan.
Since we're not allowed to post links here, Google: "Stylist investigates how our kissing habits change in a long-term relationship" I'll let you draw your own conclusions.
That was quite informative, thanks for sharing it. Although one sentence is kind of troubling, and kind of what I have been worried about:
Quote
"I think it would be very difficult for a relationship to survive without kissing with tongues. Even if you’re still giving each other pecks on the lips or cheeks the relationship is in trouble.”