Purple
passion, imagination, creativity.
Purple is the hardest color for the eye to discriminate so you may not want to have large areas of it. Because of it's association with romance and passion, it makes a wonderful color for your bedding and to accent pieces like pillows, flowers, candles, etc. It is also a very mystic color, making purple and pink toned candles a great addition
Blue
trust, calming, tranquility, contentment.
Blue is one of the most calming colors. While this can be a good trait for creating a relaxing environment, used too much it can generate depressing moods as well. Because blue is a receding color, objects this color will appear farther away. If you're room is small or you have a lot of furniture to work with, try using blue to make the room appear larger.
Green
nature, renewal, freshness, hope.
Green is the most restful color to the eye. In Feng Shui it is considered to promote getting in touch with your roots and nature. A great advantage for a stable, grounded relationship.
Yellow
cheer, vitality, optimism.
Yellow is the color the eye processes first but it is also the most fatiguing color to the eye, so this makes it a great color for accents in your room. Any area you'd really like to focus on, add a touch of yellow by using one of the natural sources below! Another tip to keep in mind: because yellow is such a motivating and dynamic color, you may not want to use too much of it if your intention is to create peaceful, passionate, romantic atmosphere.
Black
sexuality, power, sophistication.
Black is inately a very sexual color but it is also very strongly associated with death, corruption and depression. A softer way to implement this sexy color is through black and white photos (maybe of romantic couples) and through your clothing for an intimate night. A fun change would be to have a set of black silk or satin sheets to use for special romantic occasions!
Red
passion, romance, finding a new love, keep love, sexuality
Red is an aggressive color that, although may increase sexuality, if used too much it can arise negative and depressive feelings.
White
purity, truth, cleanliness.
While white is a great way to promote a larger, cleaner room, pure white can produce a glare and cause optical fatigue when used in large quanities. To break up white walls, add a few romantic paintings or wall mounted candlestick holders. To add color to a white bedding set, add a few colored throw pillows. Silver is a very powerful aspect of white and can promote eroticism... especially great in the bedroom! Try adding a few silver metallic colored candles on a nearby bed side table.