I have had a similar experience. I don't mind at all if they talk about the best way to catch a girl at the next party or how cool it would be to hide the word penis in the final version of their thesis. But I can't participate in that talk, though I started to appreciate sexy women now. I just can't help being aware that I'm the only girl an an all male group and feel out of place. I feel more comfortable if I imagine that I'm a guy too, I've even thought if it wouldn't be nice to have a gender change to better fit in.
