There are jokes about watching and reading pornography, by customers and the husband.
There are relationships which involve essentially hooking, and sleeping around, though thus far not with the primary characters. Condoms are discussed in one episode. Awkward distinctly unfunny discussion about a single pastor's sex life is had.
Shirtless men are often seen throughout the series.
In episode 2, a photography student's work is seen by Mr Kim. Instance of male rear nudity. Just skip the seeing the pictures part and you'll be set.