I just use some generic WTB Rocket saddle on my mountain bike. It's not the saddle I would choose for long distance biking, but it does well for mountain biking. It's comfortable enough to handle couple of hours of biking, and it's narrow enough that I can get behind it with ease. I've never heard of anyone crushing balls... unless you're doing it wrong. As been mentioned above, you will want to, no, you will have to stand up a lot, whether you're going up steep hill, going fast downhill, or going over obstacles. If you don't stand up, then yes, I could see your butt being smashed and balls getting crushed.