what makes kinnporsche sex different from most other BL sex scenes is that they're actually vital to the plot*
in most other BLs, the important character development and conversation happens prior to the sex, or after the sex, and not during it. in most BLs, you could do a tasteful fade to black after the shirts come off and the story wouldn't be altered at all. with kinnporsche, that's not the case. the audience needs to see what happens in the sex scenes because they develop the characters and even the plot significantly.
with the drugged sex, we cant just cut to black after porsche kisses kinn because we need to know exactly what lines were crossed so that we understand porsche's reaction afterwards. we also need to see porsche's emotions-- his joy, his teasing, his bliss, during the act-- to contrast to the blank slate of the morning after, when he is hurt and upset.
and the handjob scene has been dissected to hell and back already but it truly was the best example of non-verbal conversation i've ever seen in any show, ever. it wouldn't be enough just to see the anguish of kinn's apology and his kisses he gives as recompense. we needed to see porsche accept his affection and take control of the situation, signaling to the audience that he forgives kinn and wants to move past the hurtful things they both said.
compare this to cutie pie (no hate on it, it's just recent and has some steamy scenes to compare to). the first sex scene could have cut off way sooner-- probably right after lian asked for kuea's consent for the second time. at that point, it had been established they wanted to fuck, they knew what they were doing, and that lian wouldn't hurt kuea. we had no doubts that it would be a good experience for both of them. seeing that depicted visually didn't advance the plot or the characters. that development happened on the couch before and when they woke up the morning after.
i'm not making a moral judgement one way or another. it's totally fine if shows want to depict pretty boys having sex even if it doesn't advance the plot or characters. it's stylistic choice. but i definitely know which style i prefer.
(*ok some of them. porsche's yok-assisted strip tease was for laughs)