What would be the most difficult "boy" thing for you to give up if you had to live the rest of your life as a girl?

As the title says. As a female, I don't think I could give up video games, martial arts, shopping at gamestop, or having a band, but I know that my brother would find it hard to give up his legos (he's a 30 year old software engineer and still has his legos from childhood and uses them whenever he can).