25 year old guy from London uk, looking to be pegged by an attractive

You don't seek out a woman to peg you. That's for when you're already with one and don't want to complicate things. And there's already a mountain of men willing to pay for it. Women generally aren't interested in it since its so much physical work they're not accustomed to while not feeling much.

Just get a man to fuck your ass if you're single. It shouldn't be difficult to find one willing to use a silicone donger if you want to avoid the risks involved with his own. Lots of guys get off on that.