Sex File: Why has he stopped initiating in bed?

Pic: iStock
This is such a common problem that if you stick your question into ChatGPT you'll get a perfectly reasonable response compiled from the musings of millions of agony aunts and uncles around the globe, all desperately trying to eke out a 700-word response. I take a more academic approach, but sexual initiation in long-term relationships is not the kind of topic that attracts grant funding, so there is a real dearth of research on it.