[phekunde]

My hypothesis is that this might be indirectly related to the drug. Because sex increases blood circulation to the whole body, including the brain, this circulation helps the brain cells. Taking Viagra regularly for sexual pleasure has this positive side-effect of regular blood flow to the brain, thus reducing the chances of damage to the cells.

[q1w2]

There are many correlative factors associated with taking viagra. The fact that older people that take viagra have a partner introduces a myriad of lifestyle differences. Being sexual active is another myriad of differences.

Of all the studies I've seen recently, this one scream Correlation != Causation.