I am I homosexual?

I look at a lot of adult picture sites. I have had my prostate removed, so can no longer have an unassited erection. My wife walked in when a male solicitation type site was on the screen, with a guy exposing his penis. She was enraged and said if I looked a penises, I was gay or homosexual. I have never been sexually attracted by males. I have wathched male porn and some I find exciting, but I am turned off by anal intercourse. I am facinated with looking at pictures of males and females haviing sex, and while we did not do it often, we did several time have sex with others present and watching. This was extremly exciting to me.
Since I can no longer have an erection, I do look at pictures of nice cock, preferrably, shaved.
My question is am I gay or homosexual, or what?

Heterosexual men usually prefer to look at women. What about bisexual?