Before a relationship can be considered prohibido, there must be a barrier. Not merely an inconvenience (like living in different cities), but a structural, ideological, or legal wall designed to keep two people apart. In romantic storylines, these barriers fall into five classic categories:
A flimsy barrier (e.g., "My mom doesn’t like his haircut") kills tension. The barrier must be something that reasonable people would hesitate to cross. A marriage. A legal contract. A blood feud. A religious ordination.
Psychologists have long known that humans assign higher value to things that are rare, difficult to obtain, or forbidden. When a romantic storyline includes a clear "Thou shalt not," the reader’s brain automatically invests more emotional energy. The risk raises the stakes. A kiss that could ruin a family is infinitely more charged than a kiss between two available singles.