But i won't do what?

In Meat Loaf’s song, “I Would do anything for love”, he is constantly saying that he won’t do that. The word that has no antecedant. What won’t he do?

Yep, it is antecedent-free. Except for during the bridge in the song, where the woman is singing, she says:
“I know the territory; I’ve been around.
It’ll all turn to dust and we’ll all fall down,
And sooner or later you’ll be screwing around.”

(Meatloaf)
“No I won’t do that”

Anything for love except for sleeping with someone else. There ya have it; that Loaf is a giver

It’s been a long time since I heard that one. Hmm. This might help:

The lyrics.

Ever seen the Abbot and Costello “Who’s on First” routine?

I would so anything for love, but I won’t do that.
You won’t do what?
No, not “what”, that.
Yes but what is it you won’t do?
No! That is what I won’t do.
But what is “that”???
No, “what” isn’t that, “that” is that!

…etc, etc.

Using LL’s link it should be obvious. When this song first came out I remember he gave Meatloaf gave an interview which I caught on the radio. He was surprised by the questions and gave the answer. And what wont he do?

“(he’ll) never forget the way you feel right now”

5th line.

He said the same thing on Storytellers -
He won’t “forget the way you feel right now”
or “forgive myself if we don’t go all the way, tonight”
or “do it better than I do it with you”
or “stop dreaming of you ev’ry night of my life”

or the last two verses the girl sings (see that it’s time to move on
and be screwing around)

Obviously none of you have watched Spice World, otherwise you (like me) would know the answer to that question. (Yes, I watched it. Fun little movie. A friend dared me to watch it, so I dared him to rent it, and we wound up with it and a couple of Jackie Chan movies. That’s what our wives get for sending us to Blockbuster with no suggestions…)

You see, in the movie, Mr Loaf plays the part of the Spice Girls’ tour bus driver. At one point in the movie, their weasely manager stops by the front of the bus and says something along the lines of “hey, the crapper’s backed up - go plunge it.” Meatloaf replies: “Hey, man, I love those girls. I’d do anything for them. But I won’t do that!”

It may be significant that just before the girls go out into the woods, one of them says something along the lines of “Isn’t it funny that our toilets all get blocked at the same time every month?”

A friend of mine assured me that it meant “perform oral sex”. So he was just pulling my leg, then?