You can fight flu and cold without ever getting out from under the sheets. Sexual activity – yep – increases your levels of immunoglobulin A (IgA), the cell protein that fights viral infections and helps you ward off colds and flu. A study of Pennsylvania college students showed that those who engaged in sexual activity once or twice a week had 30 percent higher levels of IgA than students who were abstinent. There’s some good news to get you through the rest of flu season.
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