Got my Rio Ucayali BN pleco last fall and have never been sure if it's male or female.
I haven't seen it for quite awhile (lots of driftwood/rocks in my tank) but a few days ago it was out in the front of the tank, and it now has bristles sprouting from the top of the snout. So it's a boy!!
I'm trying to imagine how my non-fishy friends would react to this exciting news bulletin!
LOL I know what you mean,,, I keep saying I can't wait to be able to tell the sex of my three BN babies and the family and friends just roll their eyes Congrats!