Well I have actually, and I've had sex with conventionally beautiful people that I didn't really like, because it was physically convenient.
Actually since being at school I have and had friends that many would describe as unattractive. They were/are smart, fun, some hugely talented. Oh, and might I say, some were verry hung.
Some of the "beautiful people" I have been with have been very ugly on the inside. Some have had small dicks too.
The most important thing to me at the time, and now perhaps, is that we enjoy/enjoyed each others sexuality. I like to think I don't just choose people because of how they look these days.
Don't get me started on regrets LOL. Actually I don't have any. Have I grown as a person? I hope so. Moments of weakness are part of the human experience.