" I know theres a bolted/sealed connection for a toilet and there is like a long tube which from time to time expels water "
Not sure what you are talking about, but this sounds like something is wrong with this. Might be worth your time to have a pro check out the system to be sure everything is hooked up properly. Our first house had a floor drain that had been hidden by a wall, and when the trap dried out the basement stunk like this - once we found it and kept it full, it was no problem (they sell an oil-like product for this that lasts a loooong time, if it is really in a tough spot to reach). As others have noted, that nasty smelling sewer gas is actually quite unhealthy too - you need to be sure everything is properly sealed off. If the wife is balking, you might mention that without those traps, the rats can climb right up from the sewer into your house (sort of an exaggeration, but all's fair in love and home repairs
).