Same sex attraction is not spreading because biological traits are encoded!

http://fowler.ucsd.edu/same_sex_sexual_attraction_does_not_spread.pdf

https://www.newscientist.com/article/mg22730310-100-sexuality-is-fluid-its-time-to-get-past-born-this-way/

http://thefederalist.com/2014/07/21/why-arent-there-more-gay-people/