I am of 38 and my wife of 33. After marriage we were enjoying sex like anything. But for past one year my wife says she don't have interest in having sex, and even in kissing. She says you can take it whenever I want. But she is not active. Will you please tell me remedy for these

Sometimes women's sexual interest dwindle. Has she been to see her doctor about this? There might be an underlying cause as to her not feeling in the mood anymore. Is the sex all about you? Is there anything she says is wrong or she isn't liking?