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You have to register whichever animation packs you have within the kinky world settings menu, I don't think that page lists all the codes but you can usually find them over at loverslab in their respective threads within the sims 3 forum. I see k69's animations are missing on the wiki, the code is KW_K69_Animations
A few packs should have automatically been recognized and installed/ready.
Go to
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to find some information on the menus, there are more links to further menus at the bottom of the page.
Once you get all that settled go into the "Miscellaneous" tab at the bottom of the kinky world menu and click "Debug interactions" to enable it. Back out of the menu and click on your sim > kinky world > debug > always accept to turn on a cheat on that makes all sims accept woohoo propositions. Finally, click anywhere on the ground or an object on a lot that you and another sim are on > kinky > woohoo > woohoo with... > select sim you wish to ask to woohoo. If all is well and in place you should see two sims shagging.
You may want to go back and disable debug interactions but I find them to be handy, you can find out what a sims arousal is and all kinds of other detailed info about them like their chance to accept various woohoo propositions from your current sim amongst other things.