Stationary bike: Bad for your balls?

So i regularly workout by going to the gym and weightlifting for about 2 hours and then cardio for about 40 to 60 mins. Well whenever i have to do cardio i do about half that time on the treadmill and the other half on the stationary bike. My question is: are stationary bikes bad for a mans testis? i mean i absolutely hate the stationary bike but its such good cardio and i was hearing that it may wreak havoc on your nuts? any help?