Thanks for the replies everyone.

My boyfriend and I are almost 100 percent sure that Proton is a female.

For one-when we looked up pictures online the genitals look female to us
Two- My boyfriend has seen the behavior of a female cat in heat before and
says Proton's is similar. (Sticking the butt in the air even when she/he
being touched, meowing incessantly.)

So, I am going to do some research find a vet and get her/him spayed or possibly neutered...I feel so weird not knowing for sure. But we still love little Proton no matter what!!!