Romance
Romance, romantic love, or being in love was a strong feeling of love, attraction, and emotional attachment to another individual. Something which evoked the feeling of romance was also said to be romantic. A romantic relationship was a type of interpersonal relationship. Romantic love contrasted with platonic love.

In 1930, time traveler Captain James T. Kirk believed he was in love with Edith Keeler who had to die to restore the altered  timeline. ()

In 2266, Communications Officer Nyota Uhura stated she was an illogical woman who was beginning to feel too much a part of her communications console and asked Spock why he didn't ask if she'd ever been in love. Later, Doctor Leonard McCoy admitted that he may have been looking at  Nancy Crater through a romantic haze as she looked just as he'd known her ten years before. ()

In 2375, Derran Tal, a Varro, thought it was romantic that her making love with the Human Harry Kim was a breach in protocol. Seven of Nine noted romantic love as an attraction based on sexual desire when it facilitated procreation. Seven also noted that the Borg had referenced romantic love in over six thousand assimilated species. Kim later disobeyed Captain Kathryn Janeway's orders because he and Tal were in love. Seven had assumed that romantic love was a Human weakness, but saw that it could also be a source of strength. ()

See also 
 Affair
 Dating
 Intimate relationship
 Sexual relationship
 Romance novel
 Romanticism

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Social sciences
Psychology