Here's a few more to ad in:
The first was somewhat cool, as it was brought up by my SO in casaul conversation. She was giving me a general praising, telling why she felt I was a desirable man. She tells me something like "you're good looking, good in bed, successful, you stay in shape and you have a great cock." I thought it was kind of interesting that she threw that into her short list of reasons to like me.
Another interesting diversion was with this same woman. One day in bed she spent about ten minutes touching and tracing my cock, telling me all the reasons it was pretty and aesthetically pleasing. I had a whole new appreciation for my tool after she got done. I'd really not thought about a lot of the details this way (symmetry, curve, shape, color, etc. in addition to size.)
On another occassion (this woman is a more than a bit of a cock worshiper, so she is good for a lot of material), I was asking her how she felt about flaccid cocks. She told me she really like mine. When I asked why she said "because even if that's all you had hard, it would still be big enough. Plus you still swell up like this for me," as she held her hands about chest width apart. "Your soft cock is as big as a lot of guys hard." Again, something I kind of knew, but it was nice to hear.
A reaction more in line with traditional reactions in this thread. There was another woman that I recently had sex with that was an interesting case. She was recently divorced and, other than a brief high school romance, she had only had sex with her ex husband of 20 years. When she took down my pants she was like "no way - you have to be kidding me." She went on to tell me that her ex was small (like a roll of quarters) She said that she had an idea he was pretty small, but it never occured how small. A good chunk of our interaction during that sex encounter was her screaming or moaning different compliments about how huge my cock felt, how she'd never been fucked like that, places that had never been touched, etc. If this is an ego trip topic, that was the ulitmate ego trip fuck. To top it off, she apparently threw it in the poor guys face that she ws fucking someone two or three times his size. Whoa.
THe kicker in this last situation was e were at a party at her house when we first hooked up. She was doing all this screaming while people were out in the hall and in the other rooms of the house. When we left the bed room, one of her friends touched my arm as I walked by and said "I think she likes you," and winked.