Well now I got curious so looked it up. Females have 6 abdominal segments while males have 8. Get Cer-Timmy in a compromising position on his/her back to determine this. There are other differences between males and females, such as antenna length/thickness and overall body shape, but as these are comparative methods I figured it would be difficult unless you had one of each sex ;-) Now we are waiting breathlessly for results!
(I know what sexing really means lol)