It's just nail polish, nothing to do with gender. Also it's common for little boys who are around mothers or older sisters a lot to want to play with makeup etc, the way the older gals do. To them it's an older kid or grownup thing, not a girl thing.
Also, emo guys and goth guys wear black nail polish fairly often. I've seen it a lot. I've seen many with eyeliner too. The only personal experience I've had of guys actually wearing eyeliner or any makeup though are as follows; In the 9th grade this one really stuck up jock in my class had gotten beat up recently and it was picture day so he got his sister to put makeup on him to cover his bruises. In the early 80's I was hanging out with a lot of folks in the punk scene and there was always that one guy hanging around with eyeliner on one eye and the nickname "Snoopy". One time when I was married to my ex husband and we were staying at his dad's house and his brother was out of prison and home at the time, he and his friend Bobby Snow had got real high and drunk the night before and passed out on the couch. My ex's little brother who was about 12 at the time and I got my makeup out of my purse and put a full face makeup on those guys who were passed out on the couch. Hard hitting criminals, just out of the can there. They woke up and immediately went tot he liquor store without looking at each other closely or looking in the mirror. The little brother and I left before they got back, but I hear s**t hit the fan when they got back. LOL!
_________________
I'm giving it another shot. We will see.
My forum is still there and everyone is welcome to come join as well. There is a private women only subforum there if anyone is interested. Also, there is no CAPTCHA.
The link to the forum is
http://www.rightplanet.proboards.com