せい行為 こうい感染 かんせん しょうじゃなかったです
seikō ikansen shōjanakattadesu

Noun
Desu Copula

The polite, past negative form of 性行為感染症

1. It wasn't a sexually transmitted infection.; It wasn't an STI.

Past/Perfective
Negative
Polite
Casual Register
Medicine