Do recruits receive some form of STI awareness training during basic? Can't remember the specific film they played in Cornwallis (1970s) but do recall that there was a warning against the wrong kind of girl. Probably not as graphic as some of the ones (mostly old US military) found on YouTube. As to why CAF males have a higher incidence vice CAF females, maybe the women are just smarter. It would be interesting to see the demographics (if they exist) of the issue. Percentage of female officer/NCM ratio vs male officer/NCM ratio. Would educational level play a role avoiding STIs?
As to increased reporting/screening in the CAF vice the general population, while the military would keep stats of serving members, the numbers in the general population would (probably?) include the military cases. Unless things have changed, reportable infections in the CF had to be reported to provincial health authorities (when diagnosed in Canada), there is no separate public health authority for federal organizations.