Top Ten Sex Myths: Drinking pineapple juice will make a man’s semen taste sweet.

TRUE
Well apparently, semen is naturally bitter, and ingesting sweet drinks such as pineapple juice can indeed get into your seed. Just nibbling on the old pineapple before you get down to business will be of no consequence, you need to go hard on the juice for a few days before you'll notice a chance in the flavor of your own juice.