Is it normal to fantasize about having sex with another man?

I am a 65 year old man, a widower, and yes, have always been attracted to the female form and love having sex with women. I do identify as straight and my romantic desires are exclusively centered on women. Women's bodies, faces, their very essence attract me in a way that no man is capable of doing. Though I am able to acknowledge if a man is good-looking, I am not "attracted" to a man's looks the way I am with women.

That being said, since adolescence I have been turned on by the thought of having sex with another male. I have had a few brief encounters throughout the years that, though arousing to look back on, left me feeling weird. I am not sure now if I'd rather keep my fantasies just that or take steps to realizing them. I love jerking off to gay porn. I find extremely arousing the thought of sucking a hard, pulsating cock and feeling a hot spurt of cum hit the back of my throat; or getting fucked in the ass, his cock sliding back and forth in my anus. I also love to have my nipples fondled and I think I would enjoy having a man do that to me. The biggest turn-on, I guess, is imagining engaging in sex acts that are different from what most people would call "straight."

So what do you think?