I was told that it's tighter at the entrance, but opens up inside - whereas the vagina is usually about the same tightness throughout. I didn't find it AS pleasurable, but if it was done the right way it didn't feel bad, either. I think the fact that it was something that's sort of 'taboo' also made it more pleasurable because anything that's slightly taboo is a turn on for me. Some positions made it so that it was painful instead of enjoyable, or so I found.