First time I had a MMF threesome, the first thing my friend said to me afterwards was, "Nice dick, bro." I'm not gay or bi, he's never lead me on to think he's gay or bi, we've known each other for like 15 years at that point. Lived with each other for a few years in college, only ever brought girls home, and nothing ever got weird when we were super drunk or fucked up on who knows what else.

Even though I'm straight and have never had any sort of gay or bi tendencies, I can notice, respect, and admire a good looking dude or dick. It's not a sexual attraction, it's just an appreciation for something that's objectively great, like, "Yeah, I can see why women find that attractive," even though I have zero urge to fuck that person.