Here's a of possibilities

Only a true whore would do this. Even the most immodest stripper has the common decency to cover her breasts with air.

Space isn't real

I've done this experiment before but instead of outer space I just used what I had available.

The nipples get hard and the female makes noises.

Immediately, they'd just float. Longer term, they'd get very cold, but it takes a long time because there's nothing to conduct the heat. Some of it still radiates, is my understanding. So eventually, she'd freeze her tiddies off but just flash should be ok.

They'd likely get bigger, actually. Not much else, likely a bit of tissue damage, and then they'd freeze. They won't explode or anything.

Have you seen those weird pornos where they vacuum pump a woman's breasts? Space has even better vacuum, so it will be like that, but worse.

Nothing. You need a pressure differential for something to happen. Fat isn't stored under pressure and it's not sealed in like an eyeball.

They freeze like the rest of humans

Sunburn.