Here's a scenario:
Your wife lets all of her body hair grow out and glues on a fake goatee. Then she steps into a blank and flattens her chest. To complete things (and this REALLY turns her on) she puts on your tidy whities and a tank top and starts talking about how she wants you so bad (in a gruff voice nonetheless). Now on top of that, she wants you to dress the same way, no femininity involved.
Here's the kicker: She wants this all the time! How many of you would be up for it? Don't you think it would strain your marriage just a bit??? What if this didn't come out until after 10 years of marriage, and you find out that your feminine, pretty wife only wants to have sex while dressed as a man? What do you say to her? "I'm not gay"???
DD is absolutely right. Far too many CD's hold this selfish double standard. It's ironic how misogynistic cultural values permeate into crossdressing, no?