I've been asked to top many times. I usually tell them I am a bottom only, but there were a few times I have topped. I used to top my boyfriend from time to time. He is mainly a top, but he loves to get fucked occasionally.
I've also had a couple of fuckbuddies who were complete bottoms. The one I fucked because we had a "no face-to-face" thing going on. We would fuck through gloryholes, in the complete dark or blindfolded. That was the only part that I found interesting, I really didn't find him attractive, but he did have a beautiful muscular body.
The other guy worked for a few years at the adult bookstore. I always thought he was hot! A hairy muscle guy, kinda of a redneck country boy, with some tattoos. He also had a killer smile and beautiful blue eyes, he was very cute. I also thought he was completely straight. But it wasn't until after he had quit that I discovered that he was into me. He came over to my place or I would go to his place. We would suck each other (he had a beautiful 8" dick) and then I would fuck him. He couldn't get enough. It ended when he asked if I wanted to do a 3way with him and another top that loved to fuck. I agreed and my fuckbuddy backed out at the very last minute (I was already at the top's house). The top and I fooled around, he tried to fuck me but he couldn't get his dick hard and he was high on something. I ended up leaving. My fuckbuddy apologized after that but he also never called me again after that. But that was the same time that Craigslist got rid of personal ads. That is how we always communicated, by answering each other's ads.
But when I've had bottoms ask me to fuck them and it was either a one time thing or I didn't know them, I always told them "No thank you"