Hmmm now isnt the interesting. I've had that happen as well. I always thought it was due to laying flat but when we decided to try things in more of an upright position the same thing happened right before the big O. Yes, i agree with you, it is quite frustrating. Are you on Vitamin K? That may help with hemoptysis problems. In my opinion , ( i never asked my Dr. about it) i believe the reason for the hemoptysis during sex and right before the big O is because of the raise in blood pressure. With weakened blood vessels a much raised blood pressure could cause a break in a weak blood vessel. Vitamin K may help with this. I also take L-Lysine to help with hemoptyisis problems and it has helped a bit . You may want to bring up the subject to your Dr. about Vit.K if you arent on it already.