Most women are going to find it very, very hard to put on a ton of muscle mass without first: cleaning up their diet (super restricted), doing a ton of weight lifting that is designed to create hypertrophy, going through some serious and highly restrictive dieting, and even then they're going to need to take steroids (and a host of other chemicals). I just can't see most women doing this... really! Unless you are really into getting freakishly big, and I'm talking She Hulk size here, the strength training we do at Crossfit Koncepts is going to make you a lot stronger, a lot leaner, and move a whole lot better.
Look around any Crossfit gym and you're going to find a lot of very strong, fit women that don't look like "men with boobs". It's just not going to happen unless you toss in a whole lot of chemicals - and you really don't want to do that - ever!
Take a look at this great article from Crossfit FMS entitled "The Fear of Bulkiness and Crossfit".