Yes, there is a process called "popping" where you gently push forward the bottom part near the tail to pop their genitals out from under the anal plate. However, you could injure your snake if you don't know what you're doing, so it's best to let a vet do it. Other ways to sex your snake are to look at identifying characteristics: males have longer anal spurs, and tend to be shorter, more slender, and have smaller heads than females.