He undergoes a circumcision (with much difficulty avoiding erections during the healing stage) and quickly discovers that Dominique has gonorrhea. Carl gets tested for gonorrhea and tests negative, meaning that she had to be sleeping with somebody else.

Does Carl give Dominique gonorrhea?

He gets a late circumcision for her and she finally gives in. Dominique playfully arouses him when she hears he gets turned on to her. After learning she has gonorrhea, Dominique's dad goes after Carl.

What episode does Carl get gonorrhea?

"Shameless" Hiraeth (TV Episode 2016) - IMDb.