I have a few reasons. The biggest reason is that I just cosplay characters I love, men or women and most of the outs and characters I like just happen to be males. I also have a bit more masculine look and personality (partly due to hormonal imbalance and all that), so it is easier for me to pull off and feel more comfortable as lot of females I like have skimpy outfits and don't feel I could pull them off very well.
"All the while we been thinking you were a brilliant strategist, really you're just a lucky fool."
"I'm delicious, no one should taste this delicious!"
Derek Stiles and Victor Niguel-Trauma Center (Second Opinion version)
Mei Terumi (the fifth Mizukage) and Konan-Naruto (Manga version)
Lin Beifong and Tahno from Legend of Korra