DH probably won't have thrush TBH it's nowhere near as easy for men to develop as it is for women. Obviously if he has any symptoms then he needs treating or if you are worried but he probably doesn't have it and neither do you, it's probably just the BV.
Ok, you wanted a natural remedy, I will tell you what I do. I have suffered with recurring bouts of BV for years. I think I must have a very acidic fanjo and am very delicately balanced so can be tipped the wrong way quite easily. I also have a coil, a copper one(not sure if it makes any difference if its' copper or a mirena but anyway I digress). My DP probably has extra alkaline sperm too, something to do with diet probably and the combination makes for an occasionally whiffy fanjo, niiiiice!
I also have to add I am not a doctor or a nurse or in anyway medically qualified I have just found a way to combat this that works for me without having to use antibiotics. I would be back at the doctors every month if I didn't do this and almost permanently on metronidazole which is a really strong antibiotic and I don't want that!
OK, you will need-
Acidophilus capsules
Natural yoghurt
Medicine dispenser(the kind for giving liquid medicine to babies, looks like a syringe without the needle, you can get them from the chemist)
All it is is a pessary but I've discovered it only really works if you have a bath and douche before you put the pessary in. Here's what I do. It may seem long winded when written but it's really just a couple of baths and a pessary.
This should be done at night time, right before bed.
Prep your yoghurt. Mix in about 3 teaspoons of yoghurt with 3 or 4 capsules of acidophilus(empty the powder from the capsules)Have ready by the bed.
You will need knickers with a pad ready by the bed too.
Make sure you all ready for bed i.e lights out, teeth brushed etc because you don't want to get up and walk around once you've got the pessary in.
Run a bath, just clean, plain water, absolutely no soap.
Get in and suck in and blow out, douching basically.
Using your medicine dispenser suck up some yoghurt mixture and gently insert. I guess it's up to you how much you want to put and depends on the size of your dispenser! Experiment.
Pop your knickers on and go to sleep. Try not to get up for a pee in the night, it needs a good few hours to do it's magic.
Next day have another clean, pure bath and suck in and blow out again, a couple of times.
BV gone.
This works for thrush too if you add some canesten to the yoghurt.
I know as a general rule douching isn't recommended and under normal conditions, i.e a healthy fanjo I absolutely agree, best to leave well enough alone but this method works for me.
I have had BV, done this and gone for a GUM screen the next day and the results have come back clear. I know it sounds a bit kooky but it does work.