After being married for 20 years the sex is just the same old thing. I try different things to her but it either goes unnoticed or bitched about. I talk about trying different things but she doesn't say a word, good, bad or indifferent. I goes to great lengths to please her but she doesn't put any effort to please me. Is it too late to change? Am I doing something wrong. Can I teach an old dog new tricks or am I stuck with the lazy one?