Why do guys get tired after sex?

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The discussion centers around the reasons for fatigue after sexual activity, exploring both physiological and psychological factors. Participants note that during orgasm, there is a shift between the sympathetic and parasympathetic nervous systems, which may contribute to feelings of tiredness. The conversation also touches on potential evolutionary advantages, suggesting that post-coital fatigue could aid in energy conservation for sperm replenishment. Additionally, emotional and physical exertion during sex is highlighted as a cause of temporary exhaustion, with some attributing feelings of relaxation and sleepiness to the release of endogenous opioids during orgasm. The dialogue acknowledges that factors like stress, fitness levels, and individual circumstances can also influence energy levels related to sexual activity.
aychamo
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Hey guys;

I'm wondering why we get tired after sex. I remember reading something in a physiology book about how when you are trying to reach orgasm (i.e., sex) either parasympathetic or sympathetic takes over, but when you have the orgasm the other one takes over.

Is the taking over of one of those why we get tired?

Is there any evolutionary reasons for this? Perhaps the sleeping allows you to devote energy into rebuilding your sperm collection, which ensures you of being ready to get more copies of your genes into the next generation. I know you would make the sperm regardless, but perhaps this helps?

I guess I want to ask this too. How comes sometimes not having sex can keep you awake?
 
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People get tired after sex? sounds very foreign to me :approve: :biggrin:

Sometimes it could be stress from work, life or family.
 
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Perhaps they are out of shape, or maybe they have been "out of commission" for a while. :wink:
I guess it would probably be a case of temporary exhaustion caused by the rush of emotion from the orgasm. Intercourse is a pretty active activity so there will be some physical drainage but I think most of it would be from the emotional aspect. You put everything into achieving the final means and then it all rushes out in a relatively quick period.
 
-- sorry for this post, i was a little inebriated bc i was waiting for my MCAT score lastnight
 
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Maybe it's psychological. Omni animale post coitum triste, said some Roman.
 
aychamo said:
-- sorry for this post, i was a little inebriated bc i was waiting for my MCAT score lastnight

So, how did you do? Where are you applying to med school?
 
Tired, or just very relaxed? Orgasm releases endogenous opioids, so to put it simply, you have a bit of a buzz going and are very relaxed, which is conducive to napping.
 
I don't think that just applies to men :-p
 
Kerrie said:
I don't think that just applies to men :-p

No, it doesn't. They just get a bad reputation for it. :biggrin:
 

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