It doesn't make much sense when you think about it.. The two aren't very closely related. Also, there seems to be way more threads about anal than oral.. I think oral should get it's own forum but threads concerning rimjobs and A2M can stay in anal.
The above post is very true. Another point it that it's really the same tube, the mouth being the front and the anus being the end.
I would imagine that far more people indulge in oral than they do anal. I'd have to agree that they're very different and grouping the two together isn't particularly logical. However, the one thing this place doesn't need is yet another forum (I already get lost!), so I'm all for the status quo.
I suppose you could argue that the mouth is similar to the arsehole. Many people appear to use both to speak through sometimes, anyway.
I would highly agree, oral is A LOT more common than anal, and with good reason, it's a lot easier to stick a penis in a mouth than in a butt. But they are both really fun when done with a partner than enjoys it, but anal takes much more preparation and skill to enjoy. Personally I enjoy anal more than oral, but that's just me.
Also, until recently in much of the US, oral and anal were both considered perversions and "crimes against nature" for which you could be put in jail in some states. So, I guess they decided to put all the pervs in one place.