Hmm...well, I have a bit of trouble working up the courage to ask, so it's not often. Sure glad I asked the woman I'm dating now though...

Let's see here...if memory serves, twice. Once was only a crush in elementary school, but one girl whom I had a HUGE crush for turned me down from middle school up to high school. So not all that much, but then again, it's rare for me to ask unless I feel strongly (or it's elementary school ).