The notion that there is at least one person for every other person to have a mutal intimate relationship. Commonly referred to as there being, "plenty of fish in the sea," and as the human race continues to thrive this does indeed seem to be the case. This idea does not need to indicate any specific duration for the relationship; perhaps the relationship only needs to qualify as more than superficial (See: Hollywood).
For one such example of there being somebody for everbody, see: you are smart, i would like to make love to you
Now, is there somebody for everybody on everything?