When it comes to Metzitza B’Peh, we are not discussing a Biblical Commandment, nor are we referring to a Rabbinical enactment from the Gemarah's time. We are referring to a hallowed Minhag from days of yore to use the mouth only.
As an Orthodox rabbi living and working on Manhattan's Upper West Side, I'm thrilled to see so many single men and women actively involved in Torah and mitzvot. This is also the case in Queens, Brooklyn, Long Island, and wherever else singles are found. Whereas in the not so distant past the observance level of many Orthodox singles dropped the longer they remained single, today there are more scrupulously observant single men and women than ever before.