Mel Gibson Demanding Sex Act in Latest Tape?

It started with one tape posted on the Internet - a man sounding identical to Mel Gibson in a tirade at Gibson's now ex-girlfriend for dressing too provocatively, in the man's opinion.

"You look like a f***ing b**** in heat," the man is heard saying.

Then, reports CBS News Correspondent Ben Tracy, another, also posted on the gossip site RadarOnline.

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"You need a f***ing bat in the side of the head. How about that?" the man screams to the Gibson ex, Russian singer Oksana Grigorieva, who's apparently the one who recorded the tirades.

In a third tape, the man called her "a f***ing using whore."

And now, a fourth -- nearly 20 minutes of hate-filled vitriol, with the man allegedly threatening Grigorieva demanding a sex act, coupled with another threat.

"I deserve to be b**** first! OK. I'll burn the g***** house up, but b*** me first!" the man says.

Grigorieva wants custody of the 8 month old daughter Gibson fathered. She filed a complaint with police that sparked a domestic violence investigation against the actor.

In one recording, he does not deny hitting her. She says, "Hitting a woman when she's holding a child in her hands. Breaking her teeth twice in the face! What kind of man is that?" He says, "Oh, you're all angry now!" She says, "You're gonna get to... you know what?" He says, "You f***ing deserved it!" She replies, "You're gonna answer one day, boy."

That same call includes what seems to be a death threat, with the man saying, "I'll put you in a f***ing rose garden, you c***! You understand that? Because I'm capable of it."

"On the verbal threats alone," says CBS News legal analyst Lisa Bloom, "Mel Gibson (if it is indeed him on the tapes) is looking at up to three years behind bars."

Yet, after all the yelling, Grigorieva was silent when asked about Gibson by Hollywood paparazzi chasing her.

Gibson hasn't been heard from, either.

No surprise, says Bloom: "There's only one reason why he's not talking and that's because he's in serious legal jeopardy. I'm sure his defense attorney is saying to him you may not speak."

The two are scheduled to face off in a custody hearing Tuesday.