Horndogs thought they were getting condoms — but it was just a Trojan horse.

An Australian sex-education group has been doling out what it thought was rubbers for months — only to learn the packages were actually “lubricated probe covers” for ultrasound equipment.

The Sexual Health and Family Planning group in Canberra said it accidentally mistook the medical gear for jimmies because both have “similar packaging,” adding it had been distributing them since January.

“If you have received what looks like a condom from [us] in the past six months, do not use it,”  the organization said in an apology this week, according to Australia’s ABC News.

“These products have similar packaging and the appearance of condoms but do not provide the same level of protection against pregnancy and sexually transmitted infections.”

Critics said the group could use a little sex education themselves.

“When students are told they are being given a sexual health product like a condom, it should be a condom,” fumed Reo Golding, a student at Dickson College,  where the would-be rubbers were distributed.

The sex-ed group has passed out the bogus condoms on at least five campuses including Dickson, Gungahlin College, Canberra College, Lake Ginninderra College and Melba Copland Secondary School, the outlet reported.

Earlier this week, the principal of Dickson College sent a letter home to parents alerting them about the rubber flub.

The sex-health group said it wasn’t clear how many of the packages it had distributed since January.