In my circles, "Breaking the Fart Barrier" is a humorous sign of intimacy (and the man must go first). A step taken after sex, but before a marriage proposal. My college roommate had to promise her fiance that she would fart for him on their wedding night.
A few men had broken the fart barrier for me before I met my Aspie guy. He was always on his best behavior, so suave and rehearsed and polished every time I saw him. We'd been lovers for several months before he finally, y'know. It was an accident, and I reflexively burst out laughing. I felt awful when I realized how deeply embarrassed he was, but I explained why I was so relieved. He had so many amazing traits, I'd been wondering for a while if he was even human. I was happy he finally felt comfortable enough to do that, but he seemed genuinely afraid I'd break up with him. So I explained that if women left in a huff every time a guy passed wind, the human race would have ceased to exist long ago. He relaxed, though he didn't seem convinced.
So guys, if one slips, elevate it by explaining that it's a sign of intimacy. You don't fart for just anyone, you know. ![Smile :)](./images/smilies/icon_smile.gif)