Am I turning bi or pansexual?

I’ve always been heterosexual, but for about a year I have been experimenting anal/prostate stimulation through masturbation and I love it! Lately I found really exciting watching male transgender porn. I also seem to have a fetish for penises, especially uncut, I just love to see them ejaculating. The weird thing is I don’t particularly want to have physical sex with a man or a transgender, but it really turns me on watching it on videos. Am I turning bisexual or pansexual? Anybody ever had the same experience?