Without wanting to go into too much detail, I believe that finasteride doesn’t actually cause watery semen because it seems to appear much more watery anyway just when the whole ejaculation process happens quicker. Could noticing this not just be a result of people hurrying up the whole process to test whether their semen is normal or not after taking the drug?
There are reports that both the ejaculate and the quantity of the semen changes with finasteride. Watery semen is one of the reports. Generally, the ejaculate is consistent in each person at any one time, but the volume could vary with frequency.
I’ve been taking it for 10+ years and can still shoot Peter North style loads…