Yeah, the ass definitely takes more depth. I don’t know about width/circumference though… the vagina might win that one.
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I managed to get 2 cocks side by side in my ass but it was a stretch. I’ve no doubt my vagina could manage that more easily!
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By sheer virtue of the fact the vagina is designed to stretch big enough to allow a baby to pass through, I think it wins. Whether you’ve stretched it out that far is an entirely different issue.
From an anatomical point of view, of course it can stretch better however depth wise, my ass can take a lot more. I’ve had 9 inches balls deep in my ass. I could not do that with my vagina. Maybe I’m an anomaly
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You are not abnormal, you have just relaxed enough to open your second ring to allow colon penetration 
By the way, how do you like colon penetration ? I have read my different opinions about it. Some people were coming hard from it and some others were feeling it as a deep connection with their partner(s) while prefering shorter penetration to orgasm.
There are only 2 cocks I’ve known to by-pass my A spot but and enter my colon. It feels incredible. I’ve had dildos enter my colon but they don’t give me the same satisfaction! You’re correct about relaxing the 2nd sphincter enough to allow the cock to pass. It took practice to be able to notice it was happening and to consciously ensure it doesn’t resist. It enhances the feeling of being full even with only one cock. My boyfriend was amazingly patient and critical in my journey. I prefer the deep feeling and that is what makes me achieve anal orgasms. Last night for example I had 2 pretty big cocks that made me cum. I was on top so it happened fairly quickly. The second one took a bit more work but the guys are incredible.
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Thanks for sharing Abbi !
From your experience, what penis’ lenth is needed to allow colon penetration ?
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My wife enjoys the entering of her second spincter the most and I’m only 6” I think. She’s the first woman who always wants me balls deep in her asshole.
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I find 8 inches or bigger get to the colon. We have 2 in our group that are blessed with that!
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For me, a guy, when I am receiving, the fun starts at 8 to 10 or more inches (of a toy).
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Google says the rectum is between 15 cm and 20 cm average. So 6” and 8”. My wife seems to be the 15 cm then, cause I penetrate her inner spincter easily.
I do push my cock in as far as possible and try to fuck her with 3 cm trusts at the deepest so her inner spincter gets fucked. This is most likely to acheive in missionairy or when she sits on me. Doggy with ass up, face down, is sometimes possible but she slides away from me trusting hard.
I suspect my wife’s rectum is 12cm / 5", because I’m just 15cm / 6" and can get into the colon. She is 155 cm / 5’1" tall and was born prematurely, maybe this can explain things or… I have another hypothesis.
When I enter fully in her ass, I feel like her rectum is stretching to accommodate me, so I don’t force too much. When she relaxes or farts, her end opens and gently engulfs my head, welcoming me in a place often warmer than the previous one. The first few times she didn’t like the feeling and sometimes said to me not to push so deep. Now she just sighs.
I’ve never done exact measurements to be able to compare. What I do know is that my toy is 4.25 inches long and I can put the whole thing in my ass with seemingly no end in sight. By contrast, it hits my cervix pretty hard if I stick it in my vagina. That tells me that my ass is ready for much greater length than my vagina.
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One of my buddies in uni has a boyfriend with what she describes as ‘12 inches of uncontrollable meat’. Yes I’m a bit jealous! We have some fun conversations in the pub after lectures! I’m quite open about my bum fun. The girls (all 3 of us) on my course think I’m very weird, Guess they are correct. Tiff is doing a post grad in Psychosocial Developmental Abnormalities. A few of her buddies in her class are more openminded!
I have a lot more experience than some of the others here, but I tend to agree. Before my boyfriend, I’d never had a cock longer than 8 inches, and they all went in more or less completely. The first few times my boyfriend and I only noticed resistance starting at 7 inches. It wasn’t until we pushed harder that the passage was cleared and it went in completely, much to our mutual pleasure.
In conclusion, I think my well-stretched rectum must be around 7 inches.
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Dang it! Reading this thread just makes me want to get back to anal masturbation and depth play and I don’t have the mad money for a new longer dildo. 
Crowd funding “please help me to buy a huge anal sextoy” 
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Haha! That would be hilarious! I’m very certain absolutely everyone I know would think my account was hacked. It would almost be worth it just to watch the reactions!
Siswet prefer 12” in their ass!