Humphrey Khoza was out watching a football game with his friends when his 17-year-old girlfriend arrived in an agitated state.
"She asked how in the world I could have done such an evil thing to her"
Carrying battery acid, she proceeded to slam him for secretly filming her while they were having sex and posting the video on social media.
Khoza told TimesLive.com: "Everything happened in a blink of an eye because I saw her when she was coming with a bottle but I didn't realise that she was carrying acid.
"She just angrily called me a dog. She asked how in the world I could have done such an evil thing to her.
"It was only then that I realised that she was talking about the video that I took while we were having sex."
Khoza went on to explain that he never planned to release the sex tape of him and his girlfriend of two months, who is wearing her school uniform in the sex tape, and he has no idea how it ended up online.
He said: "We agreed to have sex, but she was not aware that I was filming the sex using my laptop computer.
"I did not intend to show anyone the video and I still don’t know how it got onto social media."
Despite the fact that he now has to urinate through a tube and requires surgery on his penis, Khoza has said he will not press charges.
He said: "Even if I press charges it is useless because it won't bring back my manhood.
"Her being in jail will just ruin her future because she is still young and I do not have the energy to attend courts."