I wonder how to keep my testicles (plus part of the perineum) from freezing. I ride a recumbent, which is making it worse because it exposes those parts to the wind much more and I use unpadded tights (i.e. no isolation from the padding). I have seen the question about pants in general but the problem is that those are overkill: expensive, hard to find, too warm (watertight but not breathable is not acceptable), not tight/aerodynamic or a combination thereof.
What I'm searching for is an additional layer to combine with my usual tights. I'm searching for solutions which are good in the -15°C to +10°C range where at the low end my legs would be comfortable in long tights and a long warm base layer and at the warm end short tights only.
This is my bike, if it's relevant: Flevobike Greenmachine with under seat steering. I lowered the seat angle a fair bit.
Clutter removed from central question text: I was cycling at ~+5°C in light rain wearing warm woolen socks, short tights, standard shirt, vest and summer gloves when this problem occurred to me. My testicles were uncomfortable during the ride, then briefly hurt a lot when warming up again back inside. I should have worn something to cover my ears, but apart from that and my testicles I was perfectly comfy - I'm an extreme cold weather person.