That's probably not blocked because the kiddies also like misspelling come. "Okey, Im cumming now."
You have no idea how many people I see use it like that.
I can think of plenty of ways s**** would be used in cybering. I'm not going to post a little mini sample here, but just trust me on that. Chances are, it's not going to be used that much in a topic anyway.
With the abortion thing, I don't even see how it's valid there. What does it have to do with anything other then the creation of a baby? I'm sure by this point, most of the people on the forums understand how a baby is made. And if it's for the point similar to this "Well, when the s**** reaches the egg...it's then considered a baby and shouldn't be aborted" just say something like "Once the egg is fertilized, then technically it's a baby and shouldn't be aborted." It's very easy not to mention it. Really, its job is to make the baby.