To Hotaru's defense, what she did was the fastest way to get some sort of financial and military support.
Although going by her own expressions, one can guess it might also partly due to her own curiosity towards sex, which ended up with her eventually craving for pleasure.
There's a few other series that do something similar with healing.
Off the top of my head, "Jinrouki Winvurga" has the MC's mech be able to heal any wounds, including the hymen. Thought the comments would be as bad as NTR doujin comments, ngl. Thanks for the TL btw