Now according to the scripture, the way to get into to fornication is by touching someone that is not your spouse or allowing them to touch you. Nevertheless, to avoid fornication, let every man have his own wife, and let every woman have her own husband. Well, any sensible person wouldn't even want them holding hands with anyone else. This might fall into the defrauding category too. And if not, it leads to fornication which definetly is defrauding.
Hand shaking can even fall into the catagory of ungodly touching.
I have seen people getting a whole lot more out of a hand shake than just a greeting gesture. One old man was too cute and cozy with the young ladies for it to be called innocent. Another young couple that were supposedly not allowed to hold hands were allowed to sit close to each other and also to shake hands. If they think you are rude, too bad. It is better to please God than man, and the forgotten etiquette of yesteryear was that the man never offerd his hand first anyway.