Looking at the data for my country, Australia, the greatest volume of STI infection by far is from Chlamydia, Gonorrhoea, and Syphilis which are in no way confined to male-to-male transmission.
If a society is looking to decrease STI infection rates I don't see why they'd limit focus to LGBT material and expect any kind of useful result.
When AIDs first appeared Australia made public health announcements addressing all forms of sex as AIDs wasn't limit to male-to-male sexual transmission either, that was merely the demographic pool that STI first appeared in.
https://www.youtube.com/watch?v=mSmaWEK_rD4