That's it. It's not necessarily about finding the perfect person to marry (yeah, yeah, yeah). A 40 year old person who has waited his/her whole life for that "right" person to come along to become intimate with and spend the rest of their life with, is missing out on intimacy.
Sex does not always have to be about commitment or marriage. Before some of you jump on me, I would not say this to a 17 year old. We're talking about a 40 year old.