Bones (2005-present)

Over four seasons, we've seen two opposites — an excessively rational, socially awkward forensic anthropologist with abandonment issues and a gut-driven, occasionally goofy FBI special agent who believes in faith and love — attract. As her respect for him as grown, so has his desire to protect her. Now that he's acutely aware of his feelings and how fragile her opening heart is, season 5 should be the most sexually frustrating yet.
Hit it or Quit It? We'd love to see them hit it for real (unlike in last season's fantasy-esque finale or when they were blackmailed to kiss under a mistletoe in season 3) during the last half of their final season — whenever that may be. Until then, we'll settle for Boreanaz's longing, I-love-you-so-much-it-actually-hurts looks. Best in the business.