And once you are married, don't do any of that Who's Afraid of Virginia Woolf? stuff when you've got people round. Never tell your friends how often you have sex. Unless it's all the time, and even then you'll have a job finding a way of saying so which doesn't make people want to gag. Your core intention is to cause envy among your friends - so, if you're with single friends, just be quite nice to each other, and if you're with married friends, be nicer to each other than they're being. Don't have an affair. Don't say undermining things like 'Yes, but you're useless, and you earn less than me, and your IQ is lower than mine, and you're getting fat, and you're a busted flush, and you'll never amount to anything, and my whole life has been blighted by having met you' even if you're having a really bad row.