Yes, like just about everything in this world: there’s an app for that—even gettin' freaky.

Since the beginning of 2013, Facebook users have been able to use the “Bang With Friends” app to choose which one of their friends they’d like to do the horizontal tango with. But here’s the tricky part: the app won’t show the object of your affection that you’ve selected them until they select you back. (Sneaky!)

But there’s just one problem: Bang With Friends sounds a lot like another, more established online app: “Words with Friends,” or “Chess with Friends,” or a bunch of the other “…with Friends” apps made by Zynga. So it’s no surprise that the social gaming company has now filed a federal lawsuit against Bang With Friends, charging the younger upstart with trademark infringement, among other allegations.

In a 22-page complaint filed in San Francisco on Tuesday, Zynga’s attorney, Dennis L. Wilson, wrote that his company “brings this lawsuit to protect its hard-earned intellectual property rights from Defendant’s opportunistic exploitation of Zynga’s famous family of WITH FRIENDS trademarks.”

In the lawsuit, Zynga asks the Court to find that the Bang With Friends name infringes on Zynga’s trademark, and that Bang With Friends should be barred from using the name in the United States. Wilson added that Zynga made “informal efforts” to get Bang With Friends to stop using the “With Friends” moniker:

But even trying to make contact with Defendant was not easy—as intended by Defendant. As Defendant’s principals now have acknowledged publicly, they intentionally took active steps to conceal their identity, because, as one explained, the service “is a little raunchy.” Corporate filings were masked. Defendant did not publicly list officers, directors, or agents and instead provided an email address of “pimpin@bangwithfriends.com” for inquiries. Zynga nevertheless undertook significant efforts to ferret out the identity of one of the Defendants’ principals. After contact was made, Zynga attempted to resolve this dispute without the need for court intervention. Defendant engaged in discussions with Zynga about changing the name from “Bang With Friends.” But it now appears that either was a ploy or Defendant has reconsidered in light of recent attention showered on it.

Bang With Friends did not immediately reply to our request for comment.