Why was the Waltz shocking to some people?

During the 19th century a dance such as the Waltz would have been shocking because of the way it was performed. The Waltz requires couples to be quite close to each other with arms around the waist (this was the main shocking bit) as well as to stare deeply into their partner's eyes. It was considered a very romantic and intimate dance and at the time this was practically unheard of.