is online on sites such as OkCupid or Craigslist (though there apparently is a lot of guys pretending to be women in the W4W section on CL).
Or you could try FetLife.
Or, if you're willing to $plurge, contact a bi sex worker.

is to not refer to humans, as "playthings"

Ever heard of a no strings attached relationship? It's consensual, I play with them, they play with me. Don't get your panties in a knot.

Twice my wife and I met great woman from POF to join us. Once We asked a server at a restaurant. All three have since become great friends.

There are also good books on this topic.

talk to Dan Savage, he would know

Are you serious?? Jesus lighten up!!

Why is this post getting so many down votes? Is Vancouver *that* vanilla? I have to meet one guy who didn't dream of having this fantasy come true and if there is a woman willing to make that happen for them, great!

adultfriendfinder !

Most people who consider others as sexual playthings are promiscuous. Most people who are promiscuous have STDs from time to time. You can either choose to believe what they tell you about their health, knowing that you are their plaything, or assume that you are taking a risk.

nothing wrong with a no-strings attached, physical relationship with one or several.

I agree with the respondents about calling other human beings "playthings" though. We all be people, not objects.

I hope that you enjoy your relationships and find what you are looking for - a consenting adult who is happy with a relationship based on adult sexual play.