Other than the color red symbolizing love and lust, red foods such as goji berries, tomatoes, watermelon, pink grapefruit, and pomegranate are said have a positive effect on male sexual function. They're all rich in lycopene, which studies have shown lowers risk of prostate dysfunction, which means a lower chance of ED!
Use it the tantra way: You've seen it in Fifty Shades of Grey and before that in 9½ Weeks—now it's your turn to blindfold your partner and feed him some sensual treats. Start by putting a small piece of each of the aforementioned foods on a tray near your bed. Blindfold your partner with a sexy silk scarf or perhaps a man's necktie.
Straddle your partner and start by teasing him/her with the juice of one fruit. Drip a little onto their face, and trace their lips without letting them take a bite. You're aiming to tease and prolong the foreplay. And have fun by having your partner try to guess what each food is. Don't forget: It's OK to get messy.