There are huge risks with ONS, not everyone might be down for it, but you'd be surprised how many people actually are. It's really just a matter of how you approach, and execute. You don't necessarily just have ONS with people you meet in clubs/bars, etc etc. It could honestly just be a friend of a friend that you've met over dinner or just someone you casually started a conversation with who just happens to be a cashier at superstore.
Now, don't expect to be reeling in 9's/10's, even 8's, if all you're aiming for is an ONS.
Unless if you go to Mirage in Surrey on a thursday night, then there's a possibility you can catch at least an 8.5.