Kissing

My question to the world is why is kissing such a big deal? I have been wondering this for quite some time. Ever since kissing has been introduced to my generation, people have made a very big deal of it.

The definition of kissing is: to touch or press with the lips slightly pursed, and then often to part them and to emit a smacking sound, in an expression of affection, love, greeting, reverence, etc. Still, I don't see why this is so important is social society.

I also wonder why it is supposed to be suppressed if the interaction is longer than a brief kiss, possibly symbolizing mutual respect. Once I saw a couple, who were clearly in love, making out. My Granny pulled me away and said, "....I can't believe they were doing that in public." I wonder why this is. If sexual attraction is a natural emotion why try to hide it?

To a greater extent I wonder why sex is such an intimate interaction. Sex is alleged to be the bonding between two people who love each other more than life it's self. What about when you hit college? In college all you are expected to do is have sex and party (speaking in a social setting). What happens when you get into your senior years? Do you still have sex then?

Any form of sexual interaction can be bought, sold and acquired. For instance, at a club one can hook up, at a brothel one can pay for sex or a "good time", anywhere one goes there is sex sounding them. Why is our culture so dependent on sex selling things and making people feel good about themselves. Another question; Why do we sell sex, sexual content and sex appeal but are not okay with others having sexual intercourse?

For clarification I am not saying to never have sex or kiss and I am not telling anyone to walk around naked waiting for sexual interactions. I am just wondering why everything is such a big deal.