Sexual Relationships 
Sexual Health 
There is much debate about how long you should wait before you have sex with a guy. Should you wait a week? a month? a few months? or just go on the first date? Here is my opinion as to why you should hold out.
I am not a prude that argues you should keep your legs closed until marriage. Usually, I am quite the opposite and think if the first date is going well you should just go for it. However, it is not that simple. I have usually found that if you do sleep with a guy on the first date you are more likely to get a callback and a second or third date and an offer of a relationship but it's not as successful as it seems.
When you have sex with a man oxytocin is released into his body. This is not just in sex, it also occurs when intimate contact is made. This boosts the males' attraction to his mate and makes him less likely to be interested in other women. So after that first date when you've slept together, yes, he cannot get you out of his mind, but not because you are perfect for him but because he's high on hormones.
Oxytocin was found to also have other, powerful effects on the brain. Under the influence of this hormone two areas of the brain lit up when they saw their partners face. This area of the brain gave the person feelings of pleasure and happiness. When they saw other potential mates it did the exact opposite and suppressed these feelings leaving the man to be more disinterested in other women. Oxytocin in women is continued to be released after orgasm which is why women like to cuddle after.
Another hormone release is dopamine. Dopamine is released on orgasm and ignites the body's reward system. So, therefore, if your partner makes you orgasm your body rewards itself. This works for both males and females.
Other than these two hormones another also become active within the body before, during and after sex.
Serotonin- High levels are released into the brain of both men and women during sex. Serotonin is an antidepressant and stabilizes your mood making you happier.
During and after sex your brain goes through many things. The lateral orbitofrontal cortex (the logical part of the brain becomes less active) becomes less active during sex. Your body closes this down as this area is responsible for fear and anxiety which can disrupt arousal and intercourse.
The release of these hormones makes us less sensitive to pain which is why things that would hurt day-to-day such as a slap or getting hair pulled doesn't hurt in sex.
If you look at the scientific part of sex we can understand a little more what actually occurs between two people. With all this going on it can cloud our judgement a little. This happens more so in men than women. If you sleep with a guy on the first date no wonder his curiosity is peaked. It's like a drug he keeps chasing, which is why he will keep on coming back.
What happens in the relationship though? So you had great sex and you both let your hormones choose your mate. At first, this works because you cannot keep your hands off each other. The hormones remain because you are having sex regularly but once that sex starts to fade so do the bonds. This leads one or both of you to look elsewhere to find that bond and fix. Since you were intoxicated the first time you had sex and didn't really get to know each other you may find you both have nothing in common or that you are not really that attracted to the person. You could be months or even years into your relationship and find out you are incompatible! You may think "I've had sex on the first date and he's stuck around" but now you know why he did. So to conclude if you want a relationship it could be better to wait.
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