By Michael Le Page. In some simple animals, such as jellyfish , the gut has only one opening, which functions as the mouth and anus. It has been known since that comb jellies — which superficially resemble jellyfish, but belong to a separate group called ctenophores — have a through-gut , with a separate mouth and anus. Some even have more than one anus. But when Tamm studied the warty comb jelly Mnemiopsis leidyi , he could not find its anus. Only when the animals are actually defecating does a tiny opening appear — and it disappears again straight afterwards.
A shake of the head to a wink of the anus
Animal with an anus that comes and goes could reveal how ours evolved | New Scientist
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Embryological origins of the mouth and anus
The other day, when Ben Richmond over at Motherboard filed a story on a new kind of cave fish with its anus just behind its head , I had to know more. Still, no one was telling me what I needed to know: Why have an anus on or just behind your head in the first place. Should I be jealous? After all, they're the ones who make their homes in the muck that becomes inhospitable thanks to the oil and dispersant chemicals we leave down there.
If it feels good, anything goes! Cisgender men and people assigned male at birth have a prostate , so in these cases a butt orgasm results from stimulating the prostate. You can stimulate the P-spot through the perineum, which is the runway of skin between the balls and the anus. This is how anal orgasms work for cisgender women and people assigned female at birth. Anal penetration indirectly stimulates the A-spot in the vagina.