With a woman
Vaginal = 8.5"
Oral = 6"
Anal = 8.5"
I've never had trouble with vaginal penetration if I go slow, but have never been deepthroated by a girl.
With a man giving:
Oral = 8.5"
Anal = 8.5"
Guys will pretty much take whatever you've got, and I'm at least 6" around to go with my 8.5" length.
With a man recieving:
Oral = 11.5"
Anal = 11.5"
It was awesome, I could really get used to being a size queen.