He added he was also nervous about being on a billboard topless.
"Good thing there's a thing called Photoshop these days," he said. "Hopefully that does wonders for me."
Perenara, 24, and Curry, 28, both had previous experience modelling undies for Jockey in earlier campaigns.
Curry's preparation for the shoot involved "slimming down on the food and [doing] a bit more core at the gym".
"A lot of the boys do a bit more ab work and then couple days out cut the water all together."
Perenara said his partner was "sweet with" him being half naked in the ads.
"I remember the first one, she was a little bit hesitant about it, but then she saw what it was. It's all pretty low key and stuff. So she's all good."