At the start of every relationship, everything is brand new, and we just can't get enough of our partner. During the honeymoon phase, we engage in extra PDA, barely keeping our hands off each other, especially sexually. However, there comes a point where one of us wants sex, and the other isn't in the mood for it, but science suggests we should consider having more sex for our health's sake.

Sex droughts can hit couples, which can be a sign of comfortability, or married life. Infrequent sex can occur due to children, work, and stress, but having sex can actually lighten the load of these daily obstacles.

Read More: Does 'Going Down' On Your Partner Have Biological Roots?

April Masini, relationship expert and author, believes "intimacy is as important as an apple keeping the doctor away."

"Nurturing intimacy in relationships is important — and should be just as important a health concern as getting a regular mammogram or a colonoscopy! Happy, healthy, intimate relationships are crucial to good physical and mental health," she told Medical Daily.

Scientists have found the reason why sex feels so good is due to the release of dopamine and opioid chemicals. Sexual stimulation sends the brain into an altered state of consciousness; it blocks out everything else, and allows us to solely concentrate on the sensation. In other words, it enhances brain activity.

Regular sex can do more than make us feel good; it can boost our overall health in these five ways.

Boosts Immune System

Frequent sex can help keep our immune system strong, protecting us from getting the common cold. Dr. William Kolbe, author of the book The Rejuvenating Power of Masturbation, suggests sex's immune boosting power comes from its interaction with the pituitary.

"Sexual intimacy(solo and paired) sends signals to the pituitary to stimulate the major endocrine axis including the thymus gland, a major player in our immune system," he told Medical Daily.

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A 2009 study in Psychology Reports found having sex at least once or twice a week led to 30 percent more immunoglobulin A (IgA) in their saliva, than those who reported having no sex. IgA is an antibody that helps fight infections and the common cold. They reach their peak in couples who had sex a few times a week.

Lowers Blood Pressure

Sex does not significantly raise blood pressure in men, rather it can help lower it to normal levels. A 2000 study in Biological Psychology, researchers asked 51 healthy men and women, between the ages of 20 to 47 about how much sex they have; followed by measuring their blood pressure.

They concluded more sex was linked to decreased blood pressure.

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According to Kolbe: "Intimacy is an excellent cardiovascular workout thus providing positive effects to blood pressure. The increase in sex hormone production, especially estrogen, is very beneficial for the heart."

Aids Heart Health

Unsurprisingly, sex is good for lowering our blood pressure, and for reducing the risk of heart disease. A 2002 study in J Epidemiol Community Health found regular sexual intercourse reduces the risk of stroke and coronary heart disease (damage or disease in the heart's major blood vessels) in men.

Similarly, a 2010 study in the American Journal of Cardiology found men with low frequency of sex had an increased risk of cardiovascular disease. Men who reported sexual activity of once a month or less had a higher risk of cardiovascular disease than men who reported having sex twice a week or more. This study is the first to look at frequency of sex and heart risk independently from erectile dysfunction, according to the researchers. They speculate men who are having sex regularly, may be in supportive intimate relationships. This may improve health via stress reduction and social support.

Stress Reducer

Feeling relaxed and mellow after sex tend to go hand in hand in the bedroom. A 2002 study in Archives of Sexual Behavior suggests semen may have antidepressant properties. Contact with semen during sex can help boost happiness levels for women, therefore, reducing stress

"Sex can reduce a woman's stress level. This is especially so if the woman is relaxed and not constricted during the sex," Dr. Fran Walfish, Beverly Hills family and relationship psychotherapist, told Medical Daily.

Keri Simon, a clinical social worker in St. Louis, who sees many couples, believes the stress hormone cortisol is reduced via a connection.

"More is communicated through intimate gestures which in a primitive example, communicates we have no need to be on defense, addressing our fight or flight responses. This communication is powerful — just ask anyone who has felt connection through a squeeze of the arm, pat on the back, hug, etc., and they can share that human intimacy is a powerful force of connection,” she told Medical Daily.

Improves Sleep

It's likely some of us pass out right after sex, and this happens for a reason. The endorphins released during sex can help us enter natural states, like euphoria, leading us to feel less stressed. The oxytocin released during orgasm also promotes sleep. They're released from the pituitary gland of the brain during periods of strenuous exercise, emotional stress, pain, and orgasm. Oxytocin is known as the “love hormone” because it's typically released when two people make physical contact.

Interestingly, a 2014 study found women in romantic relationships who got an extra hour of sleep had higher levels of sexual desire. They also experienced a 14 percent increase in the likelihood of sex the next day. Women with longer average sleep duration also reported greater vaginal lubrication during sex than those with shorter average sleep.

The relationship between going to sleep and good sex seems to work both ways.

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