All of them?
I really can't stay, I've got to go away
This evening has been So very nice
My mother will start to worry My father will be pacing the floor
So really I'd better scurry But maybe just a half a drink more
So this is the first verse. She saying she should leave because her parents would worry, but then says she'll stay for another drink. Because she wants to stay.
The neighbors might think Say what's in this drink?
I wish I knew how To break this spell
I ought to say, no, no, no sir
At least I'm gonna say that I tried
I really can't stay
But baby, it's cold outside
Again she starts with worrying about the neighbors. Agrees that "Whats in this drink" sounds wrong nowadays, but as pointed out in several articles that's a misunderstanding of a common 40's joke.
She says she "ought" to go, not that she wants to. "I'm gonna say that I tried", to protect her reputation. Then finally she says "I really can't stay, but baby its cold outside", again reinforcing that she very much wants to.
I simply must go The answer is no
Your welcome has been So nice and warm
My sister will be suspicious My brother will be there at the door
My maiden aunts mind is vicious
But maybe just a cigarette more
Same thing again. She says she "must" go, not that she wants to. Again talks about her sister, her brother and her aunt. And once again makes an excuse to stay longer
I've gotta get home Say lend me a coat
You've really been grand But don't you see?
There's bound to be talk tomorrow
At least there will be plenty implied
I really can't stay
Baby, it's cold
Baby, it's cold outside
And again "I've got to", not I want to. She compliments him on how grand he's been, but repeats her worry about what people will say, but by now appears to have made the decision to stay because she accepts that there will be talk about them. And again finishes with "I really CAN'T stay, but baby it's cold, baby its cold outside" Also, note that she sings this in harmony with the guy. Because they ARE in harmony.
Do you not find it surprising that at no stage in the entire song does she say she "wants" to go home?