How is that relevant? You are essentially using a shame argument.

The answer is yes, everybody needs to become much better seductors. Why? Take a look at the divorce statistics and then imagine what they would look like if people were receptive to their parters needs (and actually cared about them). My guess is low, single digits and almost no messy divorces.

Becoming a better seductor is only a small subset of being receptive to your partner's needs and actually caring about them. There's a lot more to a successful relationship than sex and seduction, and the idea of no divorces if everyone started having better sex is laughable.

If someone has intimacy issues after 5 years, he/she may want to consider seeing a relationship therapist instead of buying a self-published book from some guy on the internet that tells you how to pick up women in a bar.

Regardless of that, the book is not about managing long-term relationships. Ostensibly, it's about how to get relationships started in the first place. Therefore, whether a given interaction may or may not be appropriate with a girlfriend of 5 years is irrelevant to the conversation. That was my point.

Lots of girlfriends of 5 years would say the answer to that question is "yes, absolutely".