Any advice for a long and happy marriage?

[tiredandgrumpy]

We're off to a wedding this weekend and the female guests have to give a piece of advice for the groom (& male guests advise the bride). We have to volunteer a tip for a long and happy marriage. Anyone any recommendations? Right now my ideas list seems rather negative:

• don't get a blackberry
• never expect her to clear up after you
• accept joint responsibility for the state of the house
• if you want your underpants ironing, then do them yourself
• etc etc.

And no. 11:

Ask for what you want. Subtle hints don't work.

I think being kind and polite is hugely underrated, sometimes you just need it to get by

no. 19 is pretty close to one of my newer rules - I try to assume DH has the best intentions, and isn't trying to hurt me or piss me off. This helps quite a bit.