I am a 38A/B (small B) naturally. I am slender and I think that most of it is because in my early "macho" years, I was a weight lifting fanatic and I developed some nice "pecs". They were well-defined and very manly. Now, in my early 50's I have quit the weight lifting, but I run and stay fit, so the "pecs" have greatly softened and have a bit of a bounce to them, which is nice. I sure do wish they were at least a full "B" cup.
Mackenzie
