Can't say a lot about this, 'cause I haven't transitioned yet and so. Buut, since I am, pre-T and all, very androginous it's not that hard to pass when I go to other places where nobody knows me and such. And, at the start of the school year... There were quite some new girls that would try to talk to me. xD It was reaally weird to me because I'm not interested in girls, and I'm reaally anti-social. Then, all the students from the other semesters came back to school (I went to school earlier than the other from third and fifth semester because I was accompanying my little sisters in their preparatory courses) and the new ones all found out "I'm a girl".
Now, it's really weird 'cause there are several guys in my school, that know "I'm a girl", that have been trying something with me. I just get unconfortable because I hate been seen as a woman.
But, anyway. I agree with something said before in this thread, although I haven't lived it myself. Before you begin looking simply male (or, in my case too, when nobody know you're trans and have known you before any special change in your appearance) you'll probably attract lesbian girls and straight guys, because for them you're a "masculine woman". That'll change when you look just as any other man. But, of course, there will be always people that only care for what you have down there, and such people are not worth. And, by the other hand, there will be people just the opposite, that will love you no matter if you're trans, if you got a surgery or not... Or whatever. That will love you for who you are. Regardless if they're trans or cis, hetero girls or gay guys.