I’ve considered myself heterosexual all my life.I had and still have romantic and sexual attraction towards particular men.However, there is one thing that is haunting me, namely I am able to be genitally aroused by the pictures of both male and female genitals.I began to masturbate when I was 5 or 6. When I was 8 or 9, I used to masturbate while looking at playboy pics, which was the only sexual thing in my environment at that time. I remember I used to fantasize about myself being one of those women posing for men; these fantasies accompanied masturbation as well. Now, as I am older, I don't react in that way anymore.However, I noticed that I am still able to be aroused by the pictures of female genitals. I tried to imagine myself having sex with a woman, but it simply doesn't appeal to me. Am I bisexual because of this arousal? Can I still name myself heterosexual? Or maybe it arouses me because I associate it with oral sex performed on woman(I'm virgin and use porn to masturbate)?