doghouse

Excellent idea. I did a literature search and found a very similar study (Veldhuis JD, et al. J Clin Endocrinol Metab 2000;85:1477). And your hunch is right.

In young men, there was a positive correlation between NPT and testosterone secretion, in which an increase in NPT activity respectively preceded and followed increased testosterone secretion by 12.5–32.5 and 50–60 min. Also, sleep stage and testosterone secretion rates were strongly related, such that elevations in testosterone secretion occurred -2.5 to 25 min after sleep deepened. And there was an inverse correlation between LH secretion rates and NPT. By the way, in older men (age 65-74 years) all these correlations were abolished. They concluded that there is coordination among sleep stage, central nervous system-directed NPT activity, and hypothalamically driven episodic GnRH/LH (and thereby Leydig cell testosterone) secretion, and this is abolished with age.

Thanks for your input.

Tenpudo

What, don't you have a shower fixture?

Amit Misra

So far, so good about nocturnal penile tumescence. But then, there are 16 waking hours, during which GnRH keeps pulsing. While I do recall late afternoon spontaneous erections when I was 15-20 years younger (oh come on: my 38th birthday is due on June 15. I'm not old!), I'd hesitate to claim causal relationships between daytime T pulses and erections.
Guess there's something about the waking mind that keeps the hypothalamus in check.
With reference to Post Micturition whatever it was, do I see the hypothalamus fighting back?

Wiploc

This theory doesn't <ahem> hold water.

The urine is at body temperature. If two objects of the same temperature are separated, that doesn't cool either of them off. For example, pouring a cup of coffee doesn't make the coffee in the pot cooler.
crc

Theophage

Handstand?

It's all ballistic trajectories, baby, Yeah!

Duck!

Hmmm. Here's something that sounds like most men should know offhand if it's true, but I've heard it claimed that it's impossible to urinate with a full-on erection.

This may require some experimentation on my own part, but I can't verify or deny this claim. I mean, I don't remember actually taking a piss whilst fully aroused. Is this true?


Duck!

Demosthenes

I don't think it's possible to pee while you have a full hard-on, I vaguely remember something about blood pinching off the valve at the base of the penis. However if your erection isn't a full one, then you can indeed pee but it's awkward as hell. Happened to me a lot when I was hitting my early teens.

Tenpudo

I can see this degenerating into an argument:

"But I just took a piss last night with a full hard-on!"

"Well, it must not have been a complete erection..."

Brings a whole new meaning to the term "no-true-scotsman fallacy"...

Dr Rick

You can.

The muscles that close off the urinary bladder from the prostatic urethra don't contract until just before ejaculation, and take a few minutes to relax afterwards. That's why it's difficult for a man to urinate right after orgasm

Duck!

I heard it somewhere before. But I'm not tempted to experiment myself.

Still, thanks to Dr. Rick for the reply.


Duck!