If you're looking to make that Valentine's Day movie one to remember, you need to know how to smoothly transform a simple stretch into romantic fireworks.

If you're looking to make that Valentine's Day movie one to remember, you need to know how to smoothly transform a simple stretch into romantic fireworks.

1. Know your surroundings.

This move works only in situations where being somewhat tired is acceptable. A cover of darkness also helps. If attempted at lunch, you'll simply come off as some dude who's bored but horny.

2. Start slowly.

Midway through a noticeable fake yawn, begin to stretch your arms forward, keeping them level with your chest. Clasp your hands together and hold for several seconds, mimicking actual fatigue.

3. Keep your elbows in.

Unclasp your hands and rotate your arms straight up, then over into the small space between your girlfriend's shoulders and her seat. The first point of contact should be between her upper back and the section of your arm between shoulder and wrist.

4. Watch the hands.

Once your arm is in place, wait for her to react. Only after reading subtle body-language clues should you attempt more advanced maneuvers, such as "the gentle squeeze."

5. Don't look back.

Once you go for it, don't hesitate. Also, appearing nonchalant is crucial, so don't turn your head to look for a reaction.