We don't water the lawns because it usually rains a lot here (well, not this summer). I only run the dishwasher once every few days. I have low-flow showerheads, and we keep the time VERY short. We have displacement jars in the toilet tanks. My little girl takes a bath with only a few inches of water in there and is just as clean & happy. We drink gallon bottles of water from the store because our pipes are old and I don't trust what comes out of there (check your aerator screens sometime...yuck!). We only wash very full loads of laundry, and only a few times a week. I also wash the car maybe once every few weeks (if that) because I am busy or it's raining.
On the other side, we have 30 gallons of water stored in our garage for the next big hurricane. We did not have water here at the house after Hurricane Ike for 4 days, and when we moved into the house it took 5 days for the water company/city to turn it on and get a baseline meter reading (I was SO tempted to just turn it on, but alas I am law-abiding). I know the value of NOT having water, so when we DO have it, it is not wasted.
Likewise, my gas bill is usually only $10-$12 per month, and we have a gas oven/range and our BBQ is piped into our gas main, and our water heater is gas. A little trick-- I NEVER pre-heat the oven. Just turn it on, if it's lit, food goes in...maybe add 1-2 extra minutes but my wife considers me a great cook so it's doing it's job. Most of the time, the "heat light" turns on when I've reached my preset just about when the food is done and cooked thoroughly.
Growing up extremely poor and now having a humble income really makes me be very concious of what I do and use. Utility bills that are based on usage are easily controllable (as opposed to a flat rate charge I can't do anything about), so I do my best to reduce cost. $1 less to the City or utilities company is $1 more for savings, family vacation, a night out, tithing, or debt reduction...
PS-- to spice up a marriage, yes, you can "conserve" and shower together.
Also, if you are having an argument/fighting, do it in the bathtub....VERY disarming.