@Help Chase is WAY more innocent than he appears.
Spoiler!
His brother traumatised by telling him to fu** a dog when he had his first (?) rut because "a hole is a hole" and Chase's mind broke because he's not sure if he did or didn't. Truth: He didn't. His brother's still a very sick bas****. As a result, Chase is extremely s** repulsed and scared of it. Only person he's ever had s** with is Josh.