I have used sildenafil a few times. It does make my cock harder and bigger. I can feel the difference in 30 minutes. It just seems that my cock is heavier.

And then when I can get aroused, usually by my self, my cock gets to its full size and hardness of 30 years ago. That alone feel great. Since I am older, I can play with it for a long time. It just feels wonderful to have a fully hard and sensitive cock.

Cumming feels great, but my prostate doesn't produce that much cum anymore, so there is only a little cum.

Without the stuff I can get my cock hard enough, and could even fuck with it but it is softer and smaller. It is great for getting sucked on. Less of a mouthful until just before I cum, then it grows for a few seconds just before I cum. With the drug it is much harder thru ejaculation.

First google search I try tells me that coffee drinkers are at higher risk for erectile dysfunction. So I'm guessing the rest of it is bullshit, too.

I have taken Sildenafil many times. I just take it 60-90 minutes before I expect to be using that boner and I'm all set. Once on it I get hard very easily and very quickly. It's an amazing feeling to have a 100% bursting capacity boner at the drop of a hat. Feels so good. Many times I have just taken half a dose. Seems to work fine that way, too. Probably because I don't really have ED.

Does Viagra affect your brain?
Results: Published studies reported that sildenafil crosses the blood-brain barrier, that it exerts various biochemical and physiologic effects in the brain, and that it affects information processing.

What foods help you get hard?
Here are some foods that can help you stay erect and support a medically sound erectile dysfunction treatment.

Watermelon. Watermelon contains citrulline, another precursor to nitric acid. ...
Spinach and Other Leafy Greens. ...
Coffee. ...
Dark Chocolate. ...
Salmon. ...
Pistachios. ...
Almonds, Walnuts, and Other Nuts. ...
Oranges and Blueberries.

I’ve used Viagra and generic Sildenafil several times. It usually takes about 30 minutes to take effect. I feel my cock getting heavier and know I’m ready. The important thing to note it doesn’t give you an erection. You need to get sexually aroused by porn, wanking or a partner then it kicks in! I find I get much harder erect than without Viagra and after I have jerked a load I’m still hard up and ready to shoot another load. I have no side effects except sometimes a slight headache. I’d recommend it.