Over the years I have frequently punted when shitfaced.
Not as a planned approach, but as a last minute idea as booze makes me horny as hell.
All I can say is it's resulted in a lot of shit punts and a few good ones that I can't remember as well as I would have liked.
That said, prior to discovering this site, sober punting didn't really occur to me.
Happy to say more than half of my punts are now sober and making some more sensible decisions, ie: if I can't find what I want, I leave it for another day.
On the Viagra front, I tried it once last year when I was pissed. It had no affect whatsoever to my cock on the punt, but an hour later I literally felt like I'd been clubbed over the back of the head with a baseball bat, so bad I fell over as I disembarked the train (and it definitely wasn't the booze).
15 hours later, erections on demand, but sadly I was sitting in the office by this point.
Not used it since, and will definitely approach with caution next time in terms of dose and timing, and definitely no booze.