When I started finasteride about five years ago I had little to no body hair. I've been off it for several months now and had a DHT saliva test that showed my level to be about 10.6 where most men begin in the 20 range and go upward. Yet over the past two years or so I've seen a dramatic increase in body hair - anywhere there was a bit of longer, thicker but blonde hair such as my legs has turned into longer, thicker, dark hair. Anywhere there was peach fuzz has elongated, thickened and gotten a tad darker. And my hairline has continued to recede.
I know I've seen several studies in the past that indicate that using finasteride can upregulate your androgen receptors. Whether that means there are more of them made/turned on, or that the ones you have become more sensitive, I don't know. But I believe this is what happened with me.
Oh, and someone asked elsewhere - yes, I did slowly build up estrogenic effects, increased body fat overall and in the gut, lowered libido, and though it took about 4 years to show up I realized at that point that indeed my libido was lower and that I wasn't "performing" nearly like I used to. I'm not sure what month of being off finasteride I'm at now, but I believe it's the fifth, and I can definitely say that I'm slowly 'reverting'. My body fat is slowly creeping downward, and while I'm not bouncing off the walls with a hard-on like an 18-year-old, when the time comes it's rock hard like I don't remember it being for years and years and years, the way I thought I might have to take v**** to get back to.