Control of Other Users Avatar Style

My SL boyfriend wanted me to do his hair in a way that I would be most attracted to. He didn't really want to sepnd the time fixing his style. When I was a newbie in the game I wanted more experienced members to be able to tweek my look. Can you make it so that another avatar with permission can control the fahion and style of another gamer? I woul really like this feature. Not sure why it isn't currently allowed.
Thanks!

One thing you could do is have him give you a copy of his shape and hair and then fix it yourself and give it back to him.