I was at some grubby 40th Birthday party at the weekend in a social club. DH knew one of the chaps in there and introduced me. He proffered his hand so I went to shake it and he kissed it, and then held it next to his mouth for ages.
It reminded me of how much I hate that. I don't think I've ever encountered it in a way that I've thought it was anything other than borderline letchy.
Before anybody thinks this was a dignified old boy doing it - he then went on to make pervy comments about my boobs etc so he wasn't just being nice....