Would you mind explaining what you mean by the statement above? --is your gf becoming less feminine in the sense that she no longer wears makeup or fixes her self up like she once did (or) are you saying that her body is taking on a more manly look with her lifting weights at the gym or are the hairs on her body becoming more manly (thicker, darker and showing up in weird place)?

**If it is the later one I would suggest she see a doctor about this matter as her body could be producing more testosterone and less estrogen...... hence the chances you are both seeing. Shots and medication can help this common medical problem in women.