Even though I marked myself as straight, I consider myself Asexual (not sexually attracted to anyone), but I am romantically attracted to males, so that's why I put that down. 
I have taken MBTI twice. One time I got ISTJ and the other time I got ISFJ, so I guess I alternate between the two, or something. The site wouldn't let me put down two different types. I personally think ISTJ is the better fit, so that's why I chose that one.