text: men, how does sex effect your glucose reading? mine goes up 10 to 20 points.  is that reasonable? i guess it could be possible that sex could increase your glucose.... especially after ejaculation.  when you ejaculate there is a rush of epinephrine and norepinephrine (adrenaline).  this causes your heart to race, blood pressure to increase and also your liver to release glucose from glycogen.  i am assuming that you are a diabetic... for most people, sex does not alter blood sugar at all (because the body is very good at keeping blood sugar constant... that is, unless you are a diabetic).