In order to do due diligence for this reply, I typed "finasteride" into Google Scholar, and the first suggestion was "finasteride side effects", which brings up 20,500 results, including highly cited papers dealing specifically with sexual side effects:

https://www.sciencedirect.com/science/article/pii/S174360951...

https://www.sciencedirect.com/science/article/abs/pii/S17436...

https://journals.sagepub.com/doi/full/10.1177/15579883145384...

https://www.sciencedirect.com/science/article/pii/S001502821...

I think that in that context, it would be hard to miss!