@mimi88 Actually you cleared things up for me. I thought that she hasn't been abstinent because of the harem. It actually makes a lot more sense now. I guess the author didn't want a female being promiscuous.
@mimi88 I believe she's tempted them this whole time with a "promise"till three years are up, however the emperor look-alike Jing *who really is the former emperor now* is the first to start being called on, even though he's supposed to be from commoner backgrounds.
Maybe she's a transmigrated heroine. She seduced those guys to help her stablished her position. In the end she cannot help but yearn for the emperor whose the real owner of the body loved. She's an alpha woman so pure and obedient guy is what suits her taste so its just perfect since the obedient guy is the emperor. But that's what i think/guess