Possible Clues:

• Getaways that people try to get away with
• On-the-sly meetings
• Seek, perhaps, Valentine's dates
• Lovers' secret meetups
• Meetings for two
• Illicit meetings
• Discreet dates
• Common Harlequin plot elements
• Lovers' get-togethers (... first 3 letters)
• Dates not found on the calendar