My sex life has always been very good, but in the past year, my libido fell. I also began having great difficulty maintaining erections after having no trouble getting them. Sex was over quickly With Viagra that never happens now, I can basically have sex with it every day if I wanted, or more often, and I like that it only works with stimulation. I find it works no better with a higher dose than a low one and only causes headaches at high doses.