There is no way to tell the sex noninvasively. If you don't want to personally pop or probe, you can find a reputable breeder in your area and they can do it for you. I watched about 500 youtube videos along with being shown by a friend who's a breeder how to pop correctly. It's definitely weird at first, but also shouldn't cause any discomfort. I mean, having your genitals messed with is probably uncomfortable for anyone, but I'm not sure if a snake has the ability to even tell if it's feeling violated