My fiance has experienced this. A few times. The first was just from an all out 5 hour sexathon. I was damn near dead after that myself. The last time she had one like that was when she was down here for a visit recently. I went down and gave her oral and didn't stop licking even after she came. She grabbed a pillow to bite down on and I didn't let up for somewhere between 15 and 30 minutes. She had multiple orgasms and I couldn't even touch her without her giggling. Even trying to kiss her didn't work. We both layed there laughing about it for the next hour
