Black Widow and her lovers...

[fajrdrako]

I was reading something online where fans were talking about people Natasha Romanoff has slept with, and they mentioned Tony Stark.

Now, given what we know about both Natasha and Tony, I'd be surprised if they hadn't slept together somewhere down the line, but I can't recall any relationship between them being mentioned in the comics. Not so much as a kiss. Mind you, I haven't always been a faithful reader of either The Avengers of Iron Man, so it's possible I simply missed that.

So - can anyone with more knowledge of Marvel than I have, tell me if and when Tony Stark and Black Widow have ever been lovers?