SF Weekly, the city’s free, alternative weekly paper, has compiled a list of dos and don’ts to follow in order “to be the best heterosexual you can possibly be” at Sunday’s parade, the 45th annual celebration in the “gayest city in the galaxy”. It turns out the bacchanalia has rules, or at least etiquette, especially for those “straight allies” who join the lesbian, gay, bisexual and transgender revellers.