the premise itself is founded upon his first sexual experience having been with a well endowed, older woman who was also his neighbor, which is a stereotypical fantasy of young males apparently. the fact that he can't climax directly from his gf is most likely rooted in the "correctness" of sex in an exclusive relationship. something that he wasn't initially conditioned to enjoy or identify as proper intercourse. it's actually a very soundly written and scientifically legit concept, I just wish youichi weren't as spineless when it comes to actually addressing his gf about his preferences.
the premise itself is founded upon his first sexual experience having been with a well endowed, older woman who was also his neighbor, which is a stereotypical fantasy of young males apparently. the fact that he can't climax directly from his gf is most likely rooted in the "correctness" of sex in an exclusive relationship. something that he wasn't initially conditioned to enjoy or identify as proper intercourse. it's actually a very soundly written and scientifically legit concept, I just wish youichi weren't as spineless when it comes to actually addressing his gf about his preferences.