'Glee' Star Sued -- Woman Claims Mark Salling Forced Sex Without Condom

7:10 PM PT -- Salling's publicist, Janice Lee, tells TMZ ... "There is no truth to this. It's the textbook case of a disgruntled girl looking to cash in on a TV star's success."

She adds, "We turn the rest over to Mark's attorneys and have no further comment."

Mark Salling -- a "Glee" star -- is being sued by a woman who claims he committed sexual battery by forcing sex without a condom.

Roxanne Gorzela claims in her lawsuit ... she began dating Mark in Sept., 2010. She says in March 2011, before she had to go on a trip to Canada, they hooked up ... and things got hot and heavy. Roxanne acknowledges she consented to having sex with Mark -- but ONLY with a condom.

The suit, filed by attorney Philip J. Layfield, alleges 30-year-old Mark blew off her demand and proceeded to "insert his penis into [her] vagina without a condom."

She says she protested and Mark pulled out, but re-engaged again without a rubber.

And, Roxanne says, it got worse. She claims later that month she went to Mark's house to confront him about the emotional distress she was suffering and her "health concerns." She says she found him in bed with another woman.

Roxanne -- a former Playboy model -- says she demanded on the spot he prove that he was clean (no STDs) and he allegedly responded by grabbing her and pushing her to the ground.

Roxanne says she went to the cops and filed a police report the same day.

Roxanne is asking for unspecified damages. So far, no comment from Mark.