I have had virtually no sides at 5 mg. The first two times I tried to have sex after taking finasteride, I couldn't get it up, but after I talked with my doctor who said the sides would fade, I had no further trouble. This gives some evidence to the idea of "the power of suggestion."
While I am thankful I have no sides, I am anxious about seeing results. It's been since July and I haven't noticed anything. No further hairloss though, so that's a plus.