I'm Female, and I got your drift, but many women would shy away from the fun aspect, we are made to feel ashamed that they happen. And lets face it, most men don't want to hear about them. But if it wasn't presented in the right way... "Honey! I need your help with this problem. Do you think you could help?" Most males don't know how to deal with female problems. The plus side to getting your mate to help, is that bacteria found in the female is also found on her partner, this can help stop the transmission of bacteria (yeast in particular) or at least slow it down till its under control.
Along with the vaginal dryness, it could be caused by bad bacteria also, the yogurt could restore the healthy bacteria and get this to normal.