Service shouldn't be overdone or else the guest will lose patience.
Some areas only need a quick pass and not lingering too long, even the breasts—after a bit of stimulation they've served their purpose. If you keep licking there... any woman would lose patience because these are all just preliminaries.
If it's all preliminaries, the excitement is lost.
Having been repressed for so many years, Sun Mulan didn't even require much foreplay—if Chen Mo came at her directly, she would enjoy it.
Because it was impossible for her to go looking for gigolos in normal circumstances, picking someone at random—news would leak out very easily.
Women like Wan Qian and Li Fanghua had already built a notorious reputation.
If Sun Mulan did the same, she wouldn't have reached her status today. Would the Zhang Family have no shame?