It is no doubt sexist but girls who reach puberty are very attractive to a large age range of men. Boys of the same age, only to Catholic priests. For women, it is looks that count. For men, it is success, power, confidence. Not saying that all women are gold diggers only after a wallet but confidence is something you gain overtime, with success, with power, with age. And when you couldn't get a 18yr old at 18, why would you date that girl who is now 40 when she has been used up and now desperate when with your status gain, you can get a nice young girl?
Dating sites reflect this. I have worked on two and the database clearly showed that the women tended to be more experienced (read: many failed relationships) and fed up with it and now trying to find something more longterm. Generally these women show little self-awareness of why they are this situation, 30 something with just as many boyfriends and nothing permanent.
Men are slightly more realistic but to negative. A lot of 30yr old men who now feel they have power/money to pretend to be confident are really hateful to women who they believe are now only interested because of their cash.
When these two groups meet, mis-communication is rife, a lot of men are simply not prepared to accept that a women their own age has more experience, they don't want second hand goods or even 30th hand goods. The women on the other hand don't quite get why men they turned down for years are not falling over themselves like all the guys that came before. They don't see that the guys they had before were only there for the sex and nothing else.
The men might not have much experience with relationships but neither do the women. Being used as a booty call is after all not a relationship. The only thing these women are good at is failed relationships. Think of it like this: If you try a race circuit a thousand time and crash everytime at the first corner you are NOT more experienced at racing at that circuit then someone who never even been there. It is a complex concept but an essential one if you want to understand the dating scene. A one-night stand when he never calls again does NOT teach you how to make a relationship work. In fact, if that is your history for the last decade, it seems likely you will never learn.
A lot of people approach online-dating and other dating aids with this screwed up mind set, men who hate all women because they never had the guts so ask them out, girls who been used all their life thinking it is the fault of men that none of them saw how wonderful a person she really is, people with expectation that just don't exist in this world.
Real romances? Try this, do a poll among married couples for valentine gifts and on a dating site. The results might be very different, the married couples are realistic, the dating site will have stuff that even Spielberg couldn't make up.
It is true after all, normal people don't need dating sites. That does NOT mean you will only find freaks on dating sites. It means if you are using one, you are a freak. Accept this, take a long hard look in the mirror and ask yourself: "What is wrong with me that I have to use this". It is not wrong to use dating sites but if you think you are perfect when you have to use one... you are in for a disappointment.