Sure. The first thing is to clearly understand under which circunstances you perform better and not. Phsysical state, psychological, some sexual practices or others...

For instance I can have sex in nearly every circunstances but during the first time I am with a girl (I am single) and if I have to use preservative, it has been nearly impossible for me to maintain the erection. I was reluctant to take something, but a little peace of levitra, just with that, I solved the problem.