Sex lowers blood pressure and reduces overall stress, according to Scottish research. Sex keeps colds away. Having sex once or twice a week has been linked with higher levels of an antibody called immunoglobulin A, or IgA, which can protect you from getting colds and other infections. Sex keeps you slim: Depending on how acrobatic you are, 30 minutes of sex burns 55 calories or more. It may not sound like much, but it adds up. Sex helps your heart: While we've all seen movies where an old man has a heart attack while getting his groove on in bed, the truth is having sex twice or more a week can actually reduce the risk of a fatal heart attack. Sex helps you sleep: Oxytocin, a hormone released during orgasm, promotes sleep, according to research. Sex keeps you fit below the belt: Doing a few pelvic-floor muscle exercises known as Kegels during sex offers a couple of benefits: You will enjoy more pleasure, and you'll also strengthen the muscles and minimize the risk of incontinence later in life . Sex helps you live longer. Many experts, such as cardiothoracic surgeon and best-selling author Dr. Mehmet Oz, report that having regular sex extends your life by years.