I actually feel sorry for D cup women from the standpoint of doing vigorous exercise. Based on all the comments from similiarily endowed women in their 30's-50's, who cycle, the type of bras that they have to wear...it just sounds like a big hassle to have enough support (which doesn't get easier as the years march on)..and very hot in high temperature weather to wear.
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http://cyclewriteblog.wordpress.com/ (How cycling leads to other types of adventures, thoughts)
http://velourbansism.wordpress.com