I would probably start to have a look at all the beautyproducts my girlfriend has, trying to figure out what they are and what they do.
I would use some makeup and be sure I look good.
Will check out some sexy clothes and utilize being a good looking woman. (Probably experiencing the negative side as well like people shouting to me when walking on the streets etc.)
Afterwards I'll just continue my life as I don't expect it to change that much :p