Tonight I took 100 mg of Viagra before I was going to be intimate with my girl.

For some reason it didn't work and I wasn't able to maintain an erection. And oddly enough my penis was very sensitive when she was giving me oral.

The pill I took was probably over a year and a half old. Don't they lose potency after a while?

Also I took the pill on a full stomach after eating a really high fat meal. I heard you're not supposed to do that. This could be another factor?

I also recently started taking L-Arginine. Are you not supposed to mix the two?

Just wondering what's happening here... this is like the second time in five years I've taken it and it hasn't worked. It usually works great.