I do not believe you, Asian women like all women can handle any big dicks, even BBC, the Vagina is very flexible, if it can open to have a baby it can open to have a bbc, I think you under estimate you wife ability to fuck big mans. Maybe you afraid you will wife get a taste of bbc and she be like you gf, she will want more! Trust me she will adapt, we all do and you are correct we always want more bbc!