When I do threesome with my foreigner friend (he is long enough but not so thick), the girl keep saying "slow down and too deep", and my friend get so horny and he really wanna fuck her so bad, but they're going too slow, after foreplay and everything, she finally gets wet, but still saying too deep.
So he fucks her carefully and slow, but when he finished and pull out, she suddenly says, she feels so empty in her pussy.
So my suggestion is if u never tried Chinese girls before, take the first time as a desert, and take it easy, u will found the difference with other girls.