When no matter what the problem maybe, you just keep on trooping to get a man excited or to keep going until, finally, after hours of getting humped you nut off.
Erika IS the 4 hour power house.
S: wow that was great!
E: uh! we're not finished (so she proceeds to help him get it up)
S: i'm really sorry this never happened to me before.
E: yea i'm sure. Your a waste of time. (Storms off, pissed)
E: Behold the power of a sweed (what she's thinking)