Another option which I swear by is YES Baby lubricant. It's certified organic, sugar and paraben free. It's a UK product but they ship to HK (or any global address) in a few days. It's not cheap but its worth it and also comes with a few OPKs and post ovulation lubrication which gets you back to PH neutral to prevent yeast infections etc. I've tried so many different brands and for me this is the best one.