By NBF News
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The answer to this question depends largely on who you ask. A doctor might tell you that sex is defined by hormones in your body; a therapist might say that sex is all in your head; a guru may tell you that sex is about getting closer to God.

Dictionary defines sex as a way of distinguishing male and female members of a species, usually by referencing their reproductive functions. Sex also refers to coitus or intercourse, an act that can result in reproduction. Sex is also referred to as the genitals. Saturday Sun went round to find out what people know about sex. Here are some responses.

Emeka Njoku
When you have sex regularly and an enthusiastic one too, it offeres you a lot of physiological advantages, be you male or female. This assumes that you are engaging in sex without contracting a sexually transmitzed disease. It reduces the risk of heart attack or stroke by half.

Jude Njoku
For me, when I want to reduce weight, I start having sex regularly. It helps in overall fitness. Sex is a form of exercise. A vigorous bout burns some 200 calories about the same as running 15 minutes on a treadmill or playing a spirited game of squash. The pulse rate, in a person aroused, rises from about 70 beats per minute to 150, the same as that of an athlete putting forth maximum effort.

Roseleen Morah
Muscular contractions during intercourse work the pelvis, thighs, buttocks, arms, neck and thorax. Sex also boosts production of testosterone, which leads to stronger bones and muscles. It also reduces depression especially in women. Sex in women has also been discovered as pain relief. Immediately before orgasm, levels of the hormone oxytocin surge to five times their normal level. This, in turn, releases endorphins, which alleviate the pain of everything from headaches to arthritis to even migraines. In women, sex also prompts production of estrogen, which can reduce the pain of PMS.

You will also have less frequent colds and flu, according to study. Individuals who have sex once or twice a week show 30 percent higher levels of an antibody called immunoglobulin A, which is known to boost the immune system.

Studies have shown that men in their 20s can reduce, by a third, their chance of getting prostate cancer by ejaculating more than five times a week.

John Joshua
Sex is the act of sexual procreation between a man and a woman. The man's penis is inserted into the woman's vagina and excited/stimulated with motion, until orgasm for one or both and ejaculation occurs.

Blessing Ossai
Sex is for the mature mind. It is done inside the bedroom. In fact, sex is emotional whenever you are with a man you are attracted to. If he touches, kisses and romances you, then you get stimulated and enjoy the fun of it.

Blessing Ojukwu
Sex is something men and women enjoy when they are inside the bedroom with someone you love, though it can be done outside in the dark or at the beach. But if you get stimulated in a place that is not ideal to have sex, you just have to control your emotion because it can be controllable. In fact, if sex is not enjoyable, you would not see people doing it.

Sonia Ossai
Sex is a situation where two people of opposite sex come together emotionally because, if there is no emotion, sex is far from it. Though you have to be attracted to a man before you can have sex. I think there should be sexual feelings. When you kiss and romance, then the sexual feeling arouses. I can't make love to someone I don't love. I don't know about others.

Victoria Duru
Sex is something very necessary. In fact, it has been in existence before I was born and it would always be even when I eventually grow old and pass away. I also think we use sex to ease stress. It also builds a relationship when you know how to practise it because so many marriages have crashed due to lack of good sex. In fact, it's the sweetest thing God has ever created.

Ogochukwu Okonkwo
Sex is irresistable whenever you are with someone you love. Even when you are unhappy, it doesn't stop you from having sex with the one you love because after making love to him, you are happy again. Sex is good when you are with someone you love because it is not everybody that you will enjoy sex with. Sex rules the world just like we can't do without water as human beings. You can as well own a man for the rest of your life with sex if you are good in bed. In fact, sex makes the world worth living.