So are there any sex acts that you would deem inappropriate for teachers to discuss with children at the age of puberty and beyond?  How about fisting?  

"Gay" means, in part, engaging in same-sex acts.  Without the sexual component, it just means 2 people who are attracted to or love one another, i.e. "same-sex attracted," the term that I (and the Church) thinks should be used.  You can deny the sexual component, but the kiddies figure that out and spread it amongst themselves pretty quickly.