Thats BS.I can say from my own expirience : i was on finasteride (fin) for a year then i was off fin for 5 years now im on again for 4 years.
It is true that when you start to take it your DHT goes down ,so your libido goes down too, thats logical. After some time your body adjust to some degree ,but in my case not to the pre finasteride level. So when i was off fin after a year of use my libido was crazy. Why ? Because when i was on fin my body was puzzled why DHT is so low and tried to bring it up , and the only way is to do it, to produce more testosterone (T). So when i was on fin ( and now) my T was/ is high. When i dropped fin, my T was still high and now my DHT was high too , so my libido was extremely high , after some time my body adjusted and everything was back to normal but on a high side i would say. Now i use fin again. Is it affects my libido ? I say yes. Is it affects it so much that i cant get an erection, when i need to ? No.
People are different and drugs affect bodies differently. Some people can take fin without any visible sides, some people can crash their hormone production with fin. So do your home work, go to doc. check your hormone levels ,do research and try.