I was the one who edited the post. When someone says "the back door..." it comes off as a giggly fourteen-year-old aside. "hehe... I mentioned a taboo but if anyone deletes it they're admitting they know what I was alluding to, so I can giggle about them, too". This particular aside was not essential to the meaning of the post, and it was already flagged by users, so it was easiest to just edit it out.
I don't think that was the original poster's intention at all. However, a huge part of private beta is making our site look like the sort of site an expert would want to participate on, so that we attract more experts as time goes on.
If you want to say "sodomy" or "anal sex", fine. They are precise and correct. Anything that sounds like it was said in a high school bathroom is going to make the visiting expert feel like he/she is in a high school bathroom, and not like he/she wants to stay and share expertise.