Sexuality is most definitely NOT a choice. I didn't choose to be pansexual any more than I chose to be born white. It just happened. Rather than spend the rest of my life in denial, I learned to just accept it and with enough time, I will even learn to embrace it.
To those that think there is an on/off switch to it, sorry but you're deceiving yourselves. Learn to love whomever you want, but most importantly, learn to love and accept yourself first. I, like shenanigans, have never heard of people being attracted to same sex when dressed (if we are going by birth anatomy. Apologies if this comes off as offensive), so it's something I'd honestly like to learn more about, since I'd like to learn more about both gender and sexuality
Is it a case of where you are legitmately only interested in men when dressed, or is it a case of where your inhibitions to it are lowered and find yourself more accepting of the idea when you can express femininity?
If the latter, then it strikes me as a form of denial. One where it's ok to like men because you are a girl and it becomes "straight sex". In that scenario it's wanting to reap the benefits of m2m intimacy, but without negative societal stigma attached to it. And in no way am I judging that, but am merely trying to better understand the how and why of it, as well as explain how it can strike an LGB as odd.