If you can't find the cause, treat the symptoms. Check the toilet seat seal and replace it if it's damaged. If you flush and hear just the sound on the open end, then seal is OK, but if you hear a second "splunk" sound a moment later, it's coming through the crack/hole in the seal, and it should be replaced. To do that, seat is lifted, old rubber seal removed, possibly plastic casing over the drain hole, and new one installed, then seat refitted. Then there are drains on the floor and in shower. There are silicone seals you can put inside the drains which allow water to drain down but then they close so the smell and any insects can't get up into the bathroom. Last, in case this only happens when water is running, if you are using any cotton filters on the shower head, or if you have had a shower hose a long time, especially if it's a budget model, it may be possible that there's bacteria or fungus growing inside of them. Replace the filter / shower hose, possibly shower head.
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