Thread 16713932 - /sci/ [Archived: 386 hours ago]

Anonymous
7/2/2025, 8:06:54 PM No.16713932
c0392371-800px-wm
c0392371-800px-wm
md5: c5ba784cd796dc5859315a1d382ff149🔍
How did mammals develop three different orifices for shitting, peeing and mating? Reptiles which mammals came from have only one called cloaca. How would the 'intermediate stages' in this evolutionary process work?
Replies: >>16713944 >>16713959 >>16713985 >>16713992 >>16714380 >>16714573 >>16714833 >>16716124 >>16716263 >>16716693 >>16716859 >>16716902 >>16717015 >>16718259 >>16718842 >>16719024 >>16719135 >>16719511 >>16720325
Anonymous
7/2/2025, 8:09:01 PM No.16713933
Same way they developed different cell types despite all cells being formed in your bones.
Replies: >>16714371 >>16714976
Anonymous
7/2/2025, 8:16:25 PM No.16713944
>>16713932 (OP)
how did mammals develop KHHV like me
Replies: >>16720328
Anonymous
7/2/2025, 8:36:32 PM No.16713959
>>16713932 (OP)
>Reptiles which mammals carne from
???
Synapsids (our ancestors) and Sauropsids (all extant reptiles and birds) diverged 320 million years ago at least. Anyways, this is like asking why we're warm-blooded when our synapsid ancestors were cold-blooded. It's evolutionarily useful in some cases to not have one piss shit cum hole. Chickens will die of sepsis if an egg gets stuck in there
Replies: >>16714168 >>16714544
Anonymous
7/2/2025, 9:05:17 PM No.16713985
>>16713932 (OP)
Men only have two orifices down there, not three
Replies: >>16718842
Anonymous
7/2/2025, 9:15:27 PM No.16713992
>>16713932 (OP)
Some birds (like ducks) have dicks so it seems to be a convergent trait that can evolve independently.
The internal plumbing is already separated so the process would probably just be making them "more separated" over time.
Replies: >>16714607
Anonymous
7/3/2025, 12:17:12 AM No.16714168
>>16713959
I think OP got confused because Synapsids are sometimes called mammal-like reptiles even though they're not reptiles
Anonymous
7/3/2025, 3:44:18 AM No.16714371
>>16713933
so god did it?
Replies: >>16714374
Anonymous
7/3/2025, 3:49:16 AM No.16714374
>>16714371
>so god did it?
No, magical exploding nothingness did it.
Replies: >>16716677
Anonymous
7/3/2025, 4:13:07 AM No.16714380
>>16713932 (OP)
god I wish that was me
Anonymous
7/3/2025, 4:34:56 AM No.16714385
I dont understand this picture.
I've never seen this happen before. What's going on in it???
Anonymous
7/3/2025, 10:21:13 AM No.16714544
>>16713959
warm blooded to cold blooded is easy to imagine. But going from a cloaca to anus and urethra requires such a large change to biology, it's hard to imagine how it could have happened
Replies: >>16715011 >>16715136 >>16718215
Anonymous
7/3/2025, 11:14:28 AM No.16714573
>>16713932 (OP)
That's a nice ass
Anonymous
7/3/2025, 12:12:57 PM No.16714607
>>16713992
do birds with penises pee from their dicks or from their poop holes?
i feel like separating the sex tube from the peepoo hole would be a good move, evolutionally speaking.
they might be ahead of us. i need specialized tools to open wine bottles, but a male duck
Replies: >>16717012
Anonymous
7/3/2025, 3:37:01 PM No.16714833
>>16713932 (OP)
Whatever works
Anonymous
7/3/2025, 5:42:16 PM No.16714976
>>16713933
Same way we switched from laying eggs externally to pregnancy and internal gestation. VIRUS
Anonymous
7/3/2025, 6:11:49 PM No.16715011
>>16714544
>changing your entire metabolism is simpler than diverting a few tubes instead of having them meet up
Anonymous
7/3/2025, 8:21:08 PM No.16715136
>>16714544
Piss and shit ultimately travel through a different route, even in creatures with cloaca. Shit travels directly through the intestinal tract, while piss is filtered from blood by kidneys. In creatures like birds these waste streams are simply combined in their internal plumbing. Thus there is some sort of urethral opening analogue, it simply is inside. In mammals this opening has migrated to outside.

Reproductive tract similarly has different start point to the others
Anonymous
7/5/2025, 12:01:53 AM No.16716124
>>16713932 (OP)
hot
Anonymous
7/5/2025, 12:13:01 AM No.16716133
Since we're talking about sex, how to cure PE (that started after stopping antidepressants) ?
Replies: >>16716152 >>16720457
Anonymous
7/5/2025, 12:35:08 AM No.16716152
>>16716133
just keep going after cumming. if your testosterone is in a healthy range and you dont constantly jack off, this should be easily manageable.
If you cant go full chub straight after cumming just keep kissing her and rubbing her pussy. If you cant get back to full chub in a couple minutes just rope I guess.
Replies: >>16716849
Anonymous
7/5/2025, 5:05:33 AM No.16716263
>>16713932 (OP)
time to abandon darwin
and honor larmarck
Anonymous
7/5/2025, 7:24:47 PM No.16716677
>>16714374
So god?
Anonymous
7/5/2025, 8:02:32 PM No.16716693
>>16713932 (OP)
Were urine discharged into the larger intestine, the gut bacteria would be turbo charged and gassing would be out of this world.
Anonymous
7/5/2025, 11:29:07 PM No.16716849
>>16716152
>just keep going after cumming
it's too sensitive sometimes
Replies: >>16717021
Anonymous
7/5/2025, 11:54:18 PM No.16716859
>>16713932 (OP)
Mammals didn’t come from reptiles. We came from synapsids which came from even older animals. We evolved away from a cloaca because our breeding strategy became more specialized as the eggs would develop within the body first.
Anonymous
7/6/2025, 12:55:28 AM No.16716902
>>16713932 (OP)
>reptiles only have one
Incorrect. Please review your understanding of internalization.
Imoen
7/6/2025, 3:18:06 AM No.16717012
Cotylorhynchus
Cotylorhynchus
md5: 539c160afd76ff99268f42b66a281af5🔍
>>16714607
Poop hole
Birds don't pee
The white stuff in bird poop is like their pee
Neither do lizards
So if you ever see a reptile peeing, it's actually a synapsid that as somehow survived from the Permian era
Anonymous
7/6/2025, 3:20:06 AM No.16717015
>>16713932 (OP)
So that they can take 3 cocks at the same time obviously
Anonymous
7/6/2025, 3:27:47 AM No.16717021
>>16716849
lift weights or something idk.
I dont really have the same problem. I can only assume it's a physiological difference. I am in very good health for a man.
I cum hard and it feels good as fuck the whole time. After cumming it still feels pretty good.
Note: this is only true so long as a I havent been jacking off like a retard every day. Maybe... 3 or 4 days of abstaining? I cum in 5 minutes and can just stay hard. Cumming again in about 15 minutes.
If I came in 2 minutes of sex then I would just keep going lol. Rub the pussy or something idk.
Replies: >>16720421
Anonymous
7/7/2025, 5:38:41 AM No.16718215
>>16714544
I think also a low hanging fruit no one is realizing is mutations. The usefulness doesn't spontaneously happen. There will be a rivervalley for 10 million years and the local fish/lizards will change just because of mutations. If they're fit they keep this changed model.
Anonymous
7/7/2025, 6:51:08 AM No.16718259
>>16713932 (OP)
When I did NNN last year, I ended up edging at those textbook anatomy pictures like this
Anonymous
7/7/2025, 10:23:56 PM No.16718842
>>16713985
There's a divider.

>>16713932 (OP)
The topology is the same, only that the division is further internal. You have to go further back to animals that don't have a urinary tract. Isopods don't pee, they excrete through their gills.
Anonymous
7/8/2025, 2:28:35 AM No.16719024
>>16713932 (OP)
bigger question is why my dick so small
Anonymous
7/8/2025, 5:38:12 AM No.16719135
>>16713932 (OP)
You have to do fluid exchange, and the organs require an external interface, but the interface should not be put in a place which would promote injury, so you guard it between meaty thighs
Anonymous
7/8/2025, 3:43:31 PM No.16719511
>>16713932 (OP)
That image is TOTALLY INCORRECT! THE CERVIX DOES NOT LINE UP WITH THE DICK! Multiple experiments have shown that the cervix is in fact perpendicular to the dick. The dick should be more bent too. This is virgin hentai level bad!
Replies: >>16719524
Anonymous
7/8/2025, 4:12:29 PM No.16719524
>>16719511
How were these experiments conducted?
Replies: >>16720003
Anonymous
7/9/2025, 1:55:56 AM No.16720003
>>16719524
I conducted them on your mom
Anonymous
7/9/2025, 1:14:24 PM No.16720305
God delivered to make sure man need not sit down to piss
Anonymous
7/9/2025, 1:57:32 PM No.16720325
>>16713932 (OP)
>How did mammals develop three different orifices for shitting, peeing and mating?
Natural selection. The why is more interesting. The bladder and urine separating from feces has several explanations, changes to our metabolism, reproductive strategy, and active time. Proto-mammals and true mammals during the Mezosoic were probably mostly nocturnal. We developed better senses of hearing and smell because of it. Mammals mark territory with their urine, something that birds and reptiles don’t typically do. By splitting “liquid” and “solid” metabolism, we are also great at pulling nutrients from food which syncs well with the development of our teeth. Mammals are the only class that chews food for maximum nutrient extraction.

Tl;dr we’re super efficient eaters and piss and shitters and we love pissing on shit. We evolved to imagine the smell
Anonymous
7/9/2025, 2:10:08 PM No.16720328
>>16713944
That was a mutation. Not all mutations are good.
Anonymous
7/9/2025, 4:38:13 PM No.16720421
>>16717021
>I dont really have the same problem
Foreskin status?
Anonymous
7/9/2025, 5:13:57 PM No.16720457
>>16716133
Take anitdepressants or tramadol