You can choose this one for your Valentine's day gift. The 8-Bit Dynamic Life features:

• Glowing Animated T-Shirt Displays Your Remaining Life Energy
• Buy as a Pair. When two shirts are within hugging distance all 6 hearts light up
• Black 100% Cotton T-Shirt
• Animated Decal is Removable (with hook and loop fasteners) for Easy Washing
• Battery Pack is concealed in a Small Pocket Sewn Inside the Shirt
• Runs for hours off three AAA Batteries (not included)
• You need to buy at least two shirts or one shirt and a transmitter pack for the 8-Bit Dynamic Life Shirt to function correctly.
• It will cost you $11.99 for one and $24.99 for a pair.