8-Bit Dynamic Life Interactive T-Shirt: $17.99 to 24.99

Buy two of these shirts. Give one to your sweetheart and keep one for yourself. When you're wearing this shirt away from your gal or pal, only a few of the hearts will light up. When you get close to your partner, all the hearts will glow. If you don't have a humanoid sweetheart, you can also... ThinkGeek