From my experience of eating my own precum and cum, there is a bit of difference. As for the two guys I sucked... I definitely tasted their precum, but not their full final load. I have regrets.
Glad to see people are specifically interested in Chinese wives. I've been reducing sex with my chinese wife to 3 times or less per year. I'm hoping she will take a lover.
I edge about an hour after binding my balls, wearing my wife's thong, and using a condom. Filled condom goes to the side so that I can eat the cum when I'm edging for a second time.