It was gradual. Well, and a lot of prompting from my husband. "How about THIS bad boy?", as he holds up an eight inch thick dong and waves it around like it's Christmas morning and he hit the motherload. Things like that. It wasn't something I set out to become, it just happened.
I was just wondering this today! I just got the o2 Revolution, and it's BIG. While it's not eight inches, it's 5 1/2 in circumference. It will be the biggest I've tried yet, but I have a feeling it's going to turn me into a bit of a size queen as far as toys go!