Rihanna told New York radio station Hot 97 that she snapped the photos for her then-boyfriend, whose name she didn't reveal.
Rihanna cheekily said, "If you don't send your boyfriend naked pictures, then I feel bad for him."
The "Russian Roulette" singer also said finding out the photos were online was "humiliating."
"It was the worst thing that could possibly ever happen to me. I just felt like my whole privacy was taken before that [with the other photo leak] and then, when that came out, I thought, 'Oh great, so now there's nothing they don't know about me and my private life,' " she said. "It was humiliating and it was embarrassing - especially my mom having to see that... I was nervous [but] when the world is against me she's always there supporting."