Nah. I look back on it and think "Damn, that was really hot. I'm glad I stepped out of my usual boundaries and did that!"
But one time, before I opened up and starting to like anal play (done to myself), my ex girl and I got really heated up, she was screaming, sweat covering both of us... I had just made her cum, and then she looked up at me. Just the fierce, sexy look in her eye... She could have asked me to murder a kitten and I wouldn't have been able to say no. She said "There's something I want you to let me do. You know how much more intense my orgasms are when you have a finger or two in my ass? Well, I want to try it on you."
In the heat of the moment, I said yes. She got up, forcefully sat me down on the bed, and blew and stroked my dick while she played with my ass with a finger. The whole time she was going, I loved it. Then I came in her mouth, laid down satisfied as ever... then the excitement wore off and I began to question my sanity for letting such a thing happen. I never let her do it again, and I regret that now that I like anal. Because she's the only girl I've been with that liked doing that sort of thing >:l